2017 - SUNOCO Race Fuel Modified
Series Rules - Updated
January 24, 2017
ANYTHING NOT COVERED BY THE FOLLOWING RULES MUST BE
CHECKED WITH SPENCER SPEEDWAY OFFICIALS BEFORE
PROCEEDING. SPENCER SPEEDWAY RESERVES THE RIGHT TO
ADJUST ANY RULE FOR BETTER COMPETITION. ALL DECISIONS
ARE FINAL AND BINDING.
All cars minimum weight 2600 pounds with
driver. Dry sump oil systems are not permitted. Spencer
Speedway Sunoco Weekly cars with a compression ratio of
less then 9.6 to 1 will be given a weight break of 50lbs
for a total weight of 2550. Maximum 56% left side
weight. Car with driver. NO allowances for gas,
water, oil. NO deduction for loss in weight due
to race wears. Dislodged weight CAN NOT be
returned to car for weighing after race. Absolutely
NO weight shift devices of any type.
TRACK SCALE: Unless otherwise
authorized by Spencer Speedway, at all times during an
event, all weights will be calculated on official
Spencer Speedway track scales. It is the responsibility
of each race team to see that their car meets the
specified minimum weight requirements for this division
on these scales. SPENCER SPEEDWAY SCALES WILL BE
BALLAST WEIGHT: Added weight must
be in block form of no less than five (5) pound blocks.
If ballast weight is needed to make total weight, it
must be securely fastened to the frame rails, be painted
white and car number painted on weight in a dark color.
Material and mounting must be acceptable Spencer
Speedway. NO steel or lead pellets. NO
weight is to be mounted in driver's compartment.
All bodies must be reasonably neat and
stock appearing, must be painted and neatly lettered.
Numbers from 00 to 99 two digits only, no letters'.
Number must be registered with Spencer Speedway. The
rear of the roof, at the highest point, shall be no more
than three (3) inches higher than the actual front
measurement. A maximum height of 35 inches is allowed on
the tail light panel measured from the ground to the
spoiler mounting point. Minimum body height is 40
inches. Body height shall be determined by measuring.
NO decals allowed on spoiler.
3. FRAME / SUSPENSION
All construction must be safe,
professional and acceptable to Spencer Speedway.
MINIMUM of 2 inch Frame ground clearance will be
measured at frame rail between front and rear wheels.
Checked with driver in car.
4. ROLL CAGE Must be constructed
of seamless round steel tubing with a
minimum of 1 1/2 inch outside diameter .095” wall
thickness. There are several allowable variations to the
basic roll cage design that are subject to the
discretion of Spencer Speedway. Spencer Speedway
decision on roll cage design and safety is final. The
mandatory six‑point cage must surround the driver.
5. CHASSIS RULES
Open to steel bodied automobiles provided
they comply with, and adhere to, specifications as
outlined for this division.
A. COMPETING MODELS
Spencer Speedway Sunoco Weekly Modified
Series races are open to eligible 1980 through current
year models of American‑made steel bodied passenger car
production sedans. Unless otherwise authorized by
Spencer Speedway, all combination Events shall be
governed by the 2010 Spencer Speedway specifications
APPROVED COMPETITION MODELS
CHEVROLET Cavalier, Monte Carlo,
Beretta, Corvette, Camaro
CHRYSLER Eagle, Talon
DODGE Avenger, Stealth, Daytona,
FORD Escort, Mustang , Probe
PLYMOUTH Laser, Sundance
PONTIAC Sunbird, J‑2000, Grand
OTHER APPROVED MODELS ‑ Other
models may be selected when available providing they are
the same in body configuration and meet the spirit and
intent of competitive racing as currently evidenced in
Spencer Speedway Sunoco Weekly Modified racing.
GENERAL CAR BODY REQUIREMENTS (CAR
RoC Modified body rules with the
THE CAR BODY MUST MEET THE FOLLOWING
Cars must be neat appearing. Aluminum may
be used on the body, Steel must be used for the interior
All bodies must be installed on frame in a manner
acceptable to Spencer Speedway. Window openings must
remain stock appearing and must maintain the original
manufacturers window‑opening configuration. Cars will
not be allowed to compete with altered window openings.
Bodies must be no wider than the standard width from the
front of the door panel to the rear of the quarter
panels when measured beneath the car at the rocker
panels. A minimum distance of 43 inches and a maximum
distance of 45 inches is permitted across the body at
the bottom of the front windshield opening. Bodies must
not extend below the frame at the side rails. Skirts or
additional metal may NOT extend below the body.
The floor area directly beneath the seat forward to the
front engine firewall must be made using a minimum
1/8‑inch steel. The remainder of the floor area to the
right and rear of the seat must be made from minimum
22‑gauge steel. All floor area panels must be welded
together. Streaming at the top of the windshield will
NOT be permitted. Bodies must have standard
appearing windshield opening and the windshield post
must follow standard configuration. Cars will NOT
be permitted to compete with excessive body damage.
(Excessive body damage to be determined by Spencer
Speedway) Belly pans will NOT be permitted. A
belly pan will be defined as any object or material that
alters the flow of air under the car. Determination of
whether any material or object is or is not a belly pan
shall be in the discretion of Spencer Speedway. Bottom
panel of the front nose panel may NOT extend
rearward past the edge of the harmonic balancer. The
driver's compartment may be enclosed with additional
sheet metal. All interior sheet metal must be minimum
22‑gauge steel. Interior sheet metal CANNOT be
higher than or enclose a standard window opening. Sheet
metal in driver's compartment must be horizontal from
the top of the drive shaft tunnel to the right side door
bars or angle from top of drive shaft tunnel upwards to
top of right side door bars. Angled or horizontal metal
must extend from the rear firewall or back of seat a
minimum of 26 inches forward. The interior sheet metal
behind the rear hoop may be roll formed upward to the
top of the rear hoop cross bar. The sheet metal must
extend rearward and at the center of the rear axle
housing, the sheet metal may angle upward and seal to
the bottom of the rear window opening. Interior
spoilers, wings, or wind deflectors will NOT be
permitted. Double panels will NOT be permitted.
All interior sheet metal subject to Spencer Speedway
DETAILED CAR BODY REQUIREMENTS.
FRONT AIR DAM ‑ An approved air
dam may be mounted to the front underside of cars. The
optional metal or vinyl front air dam must be mounted
perpendicular to the ground and no more than three (3)
inches behind the front edge of the nose panel. Front
nose panel and air dam must not extend past the rear
edge of the front bumper and must maintain two (2)
inches ground clearance. Nose panel and air dam must not
extend past outside edge of front frame rails. Air dams
must have a minimum ground clearance of two (2) inches.
All support brackets must be mounted to rear of air dam.
Horizontal or flat air deflectors must not extend past
the outer edges of the front nose panel side walls.
REAR SPOILER ‑ All rear spoilers
and spoiler mounting points must be approved by Spencer
Speedway. A solid rear spoiler of a minimum 1/4 inch
thickness clear polycarbonate only may be installed at
the rear deck lid and meet the requirements that follow.
An approved spoiler which controls the flow of air over
one surface only. The maximum spoiler size permitted
shall be eight (8) inches high by 48 inches wide. The
rear spoiler must not be wider than the standard width
of the rear quarter panels, measured across the top. The
rear spoiler must be installed to the rear of the
quarter panels where the rear panel meets the interior
sheet metal. During race events the rear spoiler must
not extend past the rear edge of rear bumper. Decals or
logos will NOT be allowed on the rear spoiler.
Maximum of two (2) one (1) inch wide adjustable supports
are permitted on the front of the spoiler. A maximum of
three(3) supports may be attached to the rear of the
spoiler. The supports, front or rear, may be attached to
the spoiler using a piece of one (1) by one (1) inch
aluminum angle one (1) inch long. A maximum of 35 inches
measured from the ground to the spoiler mounting point
HOODS / ROOF
All cars must be equipped with a hood
manufactured from metal or fiberglass. The hood must be
manufactured so that it will completely cover the engine
compartment, from the left side to the right side; turn
down a minimum of four (4) inches on each side, and
cover (if used) the engine side panels. NO part
hood at the side panels except for the "A" post,
shock and master cylinder covers may be higher than the
lowest part of the hood. Only openings for the air
and the distributor will be permitted. NO
portion of the hood may be higher than the bottom of
air cleaner. Hoods must be fastened with positive pin
fasteners evenly spaced across the front. All hoods must
be approved by Spencer Speedway officials. Roof must be
stock for make and model of body used.
Roofs must be steel or
An approved manufactured fiberglass roof panel may be
used. All cars utilizing an approved fiberglass roof
must install the (minimum) 1/8” thick aluminum
anti-intrusion plate in the roll cage halo as described
in the following diagram. For additional specifications
on letters A. B. D. E. and F. see the NWMT rulebook.
No Aluminum roofs.
Roof support posts must
maintain the same angles as a stock production car. The
front post ("A" post) must be mounted to the top front
of the door panel. The rear post must be anchored to the
rear quarter panels. All roof panels must be installed
in a manner that is acceptable to Spencer Speedway. The
front of the roof must be secured in three (3) places:
one (1) in the center and one (1) on each side. The rear
roof quarter window panel including the door "B" post
must be Spencer Speedway approved. The front edge of the
"B" post must be located a maximum of 24 inches from the
center of the rear axle housing forward. Rear deck lid
and interior panels recommended to be of magnetic steel.
BUMPERS / SIDE RAILS
The bumpers and side rails must be rear
of the car will be 57 inches and the maximum width
permitted will be 66 inches. Each end of the rear bumper
(from the mounting side) must be cut on an angle and
capped with a minimum of 0.125‑inch aluminum. Spencer
Speedway officials must approve alterations from this
design. All bumper caps must be welded and sharp edges
must be filed. The minimum size permitted will be 2 3/4
inches by four (4) inches by 3/16 inch thick. Bumper
must be mounted at axle height. A maximum distance of 46
inches measured at the center of the rear edge of the
bumper is permitted. Weight reducing holes will NOT
be permitted in the bumper. Any inappropriate bumper
will be disallowed. Front and rear bumper must be
securely attached in order to COMPETE.
All cars must be equipped with rear comer
rails and side rails. All rails must be constructed
using a minimum 0.083 inch thick magnetic steel seamless
tubing with an outside diameter of a minimum 1 1/4
inches and a maximum of 1 3/4 inches. Side rail bars
should be constructed using the following guidelines:
Right side bars shall be constructed by
using two (2) pieces of magnetic steel seamless tubing.
The bottom bar shall attach to the rear of the frame
rail and extend upward and outward even with the outside
of the tires, or up to a maximum of 1/2 inch outside of
the tires. The bottom side bar shall extend forward
parallel with the frame rail and angle in to the front
sub frame rail with minimal tire clearance. The bottom
bar shall be mounted centerline with the rear axle and
front spindle. The top side bar shall be attached
centerline with the rear hoop cross bar extending
outward and forward to the forward most point of the
bottom bar. The top bar shall turn down, be centered on
and attach to the bottom bar. The top bar shall have an
additional support bar attached to the front roll cage
leg bar centered on the dash cross bar. An additional
support bar must be added in the center.
The bar must be attached to the frame
rail and side bar. Two (2) additional vertical support
bars should be added, one (1) at the rear and one (1) in
the center of the side rail bar. The distance measured
at the front, center to center, of the top and bottom
bars at the turn down area shall be a minimum of six (6)
inches. The distance measured at the rear center to
center shall be a maximum of nine (9) inches and minimum
six (6) inches. Cars will not be permitted in
competition without side rails.
Left side rail bars shall be constructed
using the same guidelines described above EXCEPT
that the rear support bar may be a radiused bar that
attaches to the rear hoop bar centered on the cross bar
and extending down and attached to the frame rail. Left
side rail bars must be mounted by centering the two
parallel side rail bars with the center of the rear axle
and the front spindle or left side bars may be raised a
maximum of two (2) inches from center. Cars will NOT
be permitted in competition without side rails.
Rear corner rails must be constructed
using two (2) pieces of magnetic steel seamless tubing a
minimum of 1 1/4 inches and a maximum of 1 3/4 inches in
diameter. Both pieces of tubing shall be identically
formed and welded to a steel bumper bracket at the rear.
The tubing shall angle out and upward even with the
outside of the tires, or up to a maximum of 1/2 inch
outside of the tires and maintain a six (6) inch
dimension measured center to center. The corner bumpers
shall then turn in with a minimal tire clearance to the
rear quarter panels. Additional support bars must be
installed behind the body panels to the rear frame rails
and/or roll cage. Cars will not be permitted in
competition without rear comer rails.
All frames must meet the requirements
described in the following paragraphs. Aluminum or light
alloy frames will NOT be permitted.
A. FRAME REQUIREMENTS
1. All frames are subject to
Spencer Speedway approval. A minimum ground clearance of
two (2) inches must be maintained on any part of the
frame. All frame components must be made of steel and
welded. Holes drilled in frames, frame supports, and
cross members with the intent of making the metal
lighter are not permitted.
2. Side frame rails and rear kick
up must be constructed with .090” minimum thickness
meeting the ASTMA‑500 specifications, and be a minimum
of two (2) inches wide and three (3) inches high
magnetic steel box tubing.
The distance from the centerline of the
driveline to the left side frame rail, measured anywhere
along the frame, must be within six (6) inches (eight
(8) inches on 1989 and newer models with the frame rail
and roll cage extension) of the distance from the
centerline of the centerline of the drive train to the
right frame rail. A minimum width of 34 inches and a
maximum 46 inches, measured from center of left frame
rail to center of right frame rail, must be maintained
in the drivers compartment. A minimum width of 31 inches
and a maximum of 46 inches, measured from center of left
frame rail to center of right frame rail, must be
maintained on the rear kick up, with exception for
suspension and tire clearance. All rear kick ups must
maintain a minimum of 18 degrees from side frame rails
to top of kick up.
3. The fuel cell reinforcement
bar, using a minimum 1 1/2 inches seamless (3) vertical
supports of 1 3/4 inches by 0.083 inch minimum seamless
round magnetic steel tubing connecting it to the rear
frame cross member. The main roll cage bar and the front
roll bar legs must be connected with four (4) horizontal
door bars on both left and right sides. The top door bar
on each side must have a vertical vent window bar welded
upward and connecting to the front roll bar legs. An
optional vertical bar may extend from the roof hoop bar
radiused outward and turn down to the top horizontal
door bar on driver’s side. The minimum 1 1/2 inch steel
seamless tubing should be located in line with the
driver. The door bars must be convex in shape and spaced
from top to bottom as equal as space permits. The door
bars must be the same length and have an equal amount of
convex in both the right and left sides. The door must
have six (6) vertical studs per side of 1 3/4 inches by
0.083 minimum seamless round magnetic steel tubing
equally spaced. Two (2) angular studs must be attached
from next to the bottom door bar to the frame rail.
Right side door bars must cover a minimum of 25 inches
of door length and may be either four (4) horizontal
bars with six (6) vertical studs or two (2) horizontal
bars and two (2) bars configured in an X design. If the
X design is used, a vertical bar must connect through
the center of the X from the top horizontal bar to the
frame. A roof support bar must also extend from the
right front corner of the roof bar down to the
transmission cross member. All joints where bars meet
the main frame and meet the door bars, the roof bar and
the rear support bars, MUST have gusset plates for
reinforcement. Magnetic steel tubing, must be installed
behind the fuel cell. This reinforcement bar must be as
wide as the fuel cell and as low to the ground as the
fuel cell with a minimum of two (2) uprights from the
reinforcement bar to the rear frame cross member, evenly
spaced behind the fuel cell. An X cross member made of
one (1) inch magnetic steel tubing must be installed
beneath the fuel cell from corner to corner. The X cross
member must be welded or bolted to the rear frame rails
in a secure manner. Two (2) additional support bars, one
(1) at each corner of the protective bar, must extend
forward and be welded to the rear frame assembly.
4. The front sub‑frame assembly
must be constructed using a minimum 0.083 inch thickness
meeting the ASTMA‑500 specifications, two (2) inches
wide and three (3) inches in height steel tubing. A
minimum of 27 inches, and a maximum of 32 inches,
measured from center of left frame rail to center of
right frame rail, must be maintained from the mounting
point of upper control arms forward. All front sub‑frame
assemblies must maintain a minimum of 30 degrees angle
from side frame rails up to the top of the sub‑frame.
All sub‑frame assembly support bracing shall be a
minimum 0.090‑inch by 1 3/4 inches round magnetic steel
seamless tubing. Frame support bars, left and right,
must extend from the roll cage to the sub‑frame and must
have a downward radius bent into the bars before they
are welded to the sub‑frame. The left and right support
bars must not have any additional braces added between
the front leg bars and where they attach to the front
sub‑frame assembly. A flex support tube may be added to
the front support bar at the radius and extend forward
and be attached to a cross member. Any frame rejected by
Spencer Speedway for showing poor workmanship will not
be approved until necessary corrections have been made.
The minimum wheelbase permitted in the
Spencer Speedway Sunoco Weekly Modified class
competition is 107 inches. When measuring the wheelbase,
the minimum allowable tolerance CANNOT exceed one
(1) inch plus or minus on the other side.
7. ROLL BARS
Round magnetic steel tubing 1 3/4 inches
by 0.090‑inch seamless rollover bars are compulsory for
the basic roll cage and must be Spencer speedway
approved. Aluminum and/or other soft metals are NOT
permitted. Roll bar connections MUST be welded.
MUST be four‑post minimum fastened to top of
frame. MUST have X or diagonal brace in case
behind driver. Seat to be fastened to top of cage and
frame. Nerf bars must conform to the same as asphalt
modified. Bumpers and nerf bars must be built on 14‑inch
centerlines. Center of front and rear bumper must be at
the center of tire height ‑ 14 inches. Bumper must be
smooth and capped. MUST have drivers side window
net. Fire resistant padding MANDATORY on all bars
located near driver. May use one piece pad on drivers
door bars. MUST have vertical bar in middle of front
opening of windshield (minimum 1 inch O.D.)
8. FAN SHROUD AND DUCTS
When ducting air from the nose housing to
the radiator, air directional shields are permitted
within the duct.
Car must have self‑working starter and
must work at the beginning of the race.
1a. IGNITION SHUT OFF SWITCH: All open
wheel cars must have the (tigor) ignition cut off
switch, it will be checked and it must be operable.
Tigor switch available through Oval Speed (516)
1b. SEAT AND SHOULDER HARNESS
All seats must be aluminum and have head
rests or high back seat. Seat must be attached to roll
cage and frame. Back of seat must be mounted to the roll
cage. NO fiberglass or plastic seats. Driver must
use a minimum three inch quick release, 5 point
restraint systems. A two inch wide crotch strap is
mandatory. All safety belts must be no more than
three years old, and have readable
identification tag. Any belts older then three
years will not be allowed. NO original equipment
belts permitted. Shoulder harness must be connected to
the roll cage. All lap belts must be mounted behind the
seat and attached to the roll cage according to
manufacturer specifications. All roll bars and driver
side bars or other protrusions that driver may come in
contact with must be properly padded with approved race
car roll bar padding. All cars must have a working fire
extinguisher in easy reach of the driver. On board
central fire extinguishing systems are highly
recommended. Driver side net with quick release
mechanism is MANDATORY. No plastic parts
permitted. Boldly labeled fuel and electrical safety
switches are to be in reach of Driver and safety crews.
HANS OR HUTCHINS HEAD AND NECK RESTRAINTS
2. FIRE SUIT/ HELMET
All drivers must wear a clean one piece
SFI 3.2 drivers suit quilted and or with Nomex.
Underwear, head socks, gloves, foot socks and shoes must
meet SFI specifications.
3. GLASS WINDSHIELD
A single one (1) piece flat or radiused
type polycarbonate/ lexan windshield may be used on the
drivers side. The windshield must be mounted flush with
the cowl or dash panel and extend up to the top of the
windshield opening in front of the driver. Regardless of
the type of windshield being used, it cannot be wider
than the center of the windshield opening. A complete
steel windshield screen (with maximum openings of one
(1) inch by two (2) inches must be installed in the
right side of the windshield opening. The windshield
screen must cover the right side windshield opening from
the center windshield bar to the right side roll bar and
from the front hoop bar, at the top, down to the cowl or
dash panel. Decals will NOT be permitted on the
windshield. All windshields, windshield screens and
their installation must be acceptable to Spencer
Speedway. Driver window must have window net.
4. FIRE WALL
A front and rear firewall of a not less
than 22 gauge magnetic steel must separate driver from
the engine compartment and fuel cell. The front firewall
must be positioned below the leading edge of the
windshield. The fire walls must be sealed and welded in
All suspensions and related parts must be
reinforced and meet the following requirements:
Coil over front springs. One spring per
wheel. STEEL ONLY.
1. Coil ‑over must mount to lower
2. Strut bars will NOT be
permitted for mounting of coil ‑over.
3. Coil over springs must steel
and will be constructed with both coil ends closed and
COIL OVER REAR SPRINGS
Coil over springs must steel and will be
constructed with both coil ends closed and ground.
6. SWAY BARS
Only magnetic steel front sway bars are
permitted. Rear sway bars (anti‑roll bars) will NOT
7. SHOCK ABSORBERS
The use of shock absorbers must meet the
following requirements: Coil over shock absorbers may be
used. Shock absorbers and coil over shock and spring, by
visual reference, must remain within the outline of the
body and NO holes can be cut in the outer body
for the mounting of shocks.
SHOCKS ‑ Only one (1) shock per
wheel. All shocks subject to Spencer Speedway approval.
NO shock with a published racers net price
greater than $300.00 U.S. currency will be permitted.
Any shock to be approved must be available to all
The only shock absorbers and internal
components permitted will be those shock absorbers
submitted by the manufacturers and approved by Spencer
Speedway officials. A maximum of one (1) shock absorber
per wheel is permitted. External shock absorber
reservoirs will NOT be permitted.
The upper A‑frames and lower control arms
must meet the following requirements: Upper A‑frames and
lower control arms must be acceptable to Spencer
Speedway. When attaching upper control arms to the
mounting plate, only standard type castor/camber shims
or washers will be permitted.
9. SPINDLES, WHEEL BEARINGS AND HUBS
The spindles, wheel bearings and hubs
must be acceptable to Spencer Speedway and meet the
following requirements: Heavy‑duty magnetic steel
spindles and wheel bearings are compulsory. Aluminum or
magnetic steel hubs are permitted. The front
spindles must be attached to the frame using wheel
tethers and be secured in a manner acceptable to
Spencer Speedway officials. Spindles and hubs must be
approved by Spencer Speedway.
10. BODY HEIGHT REQUIREMENTS
Body height shall be determined by
measuring (with driver) the overall height of the car
from a distance of six (6) inches behind the top of the
windshield on the roof centerline. Minimum height will
be 40 inches. The rear of the roof at the highest point
shall be NO more than three (3) inches higher
than the actual front measurement.
11. GROUND CLEARANCE REQUIREMENTS
Frame rail and sheet metal clearance will
be two (2) inches. All ground clearance requirements
will be measured with the driver in the car.
NO Sheet metal below the frame rails!
12. WEIGHT SHIFTING DEVICES
Mechanical devices for shifting weight
which can be activated by the driver will NOT be
permitted inside of drivers compartment. Electrical,
pneumatic, hydraulic or remote control devices which
change the handling characteristics or height of the car
are NOT permitted.
13. STEERING COMPONENTS
The car steering components must meet the
following requirements: Rack and pinion steering
ALLOWED. All cars will be equipped with a magnetic
steel steering shaft. Tie rods, drag links and component
parts must be heavy duty. Interchangeable pitman arms
may be used. Pitman arms may NOT be drilled for
weight reduction. Center‑top of steering post must be
padded with at least two (2) inches of resilient
material. A quick release magnetic steel or aluminum
coupling on steering wheel is MANDATORY. The
coupler CANNOT be covered with plastic. The use
of universal joints in steering shaft must be approved
by Spencer Speedway. Only metal or aluminum steering
wheels are permitted. NO Plastic The power
steering pump must be mounted and driven off the front
of the engine.
14. BRAKES & BRAKE COMPONENTS
The car brake components must meet the
following requirements: Four (4) wheel disc brakes
MANDATORY. Only magnetic cast iron or cast steel
rotors will be permitted. Brakes must be operational on
all four (4) wheels at all times. Master cylinders and
reservoirs should be mounted on the engine side of the
front firewall. Inboard brakes are NOT allowed.
Electric wheel speed sensors or brake actuators will
NOT be permitted. Power assisted braking systems
will NOT be permitted. Only one (1) brake caliper
per wheel using only two (2) brake pads per caliper will
be permitted. Only a single brake bias system which
connects to the balance bar of the brake pedal assembly
will be permitted. Inline brake proportioning systems
will NOT be permitted.
The brake cooling system must be
acceptable to Spencer Speedway and meet the following
requirements: One (1) air duct per wheel may be used for
brake cooling. All scoops must be acceptable to Spencer
Speedway officials. Maximum dimension of front brake air
scoops is three (3) inches by eight (8) inches when
mounted to the front sub‑frame or front bumper. If the
brake scoops are not operational, they must be blocked
off. Screens and air ducts, from the opening to the
brakes, must be acceptable to Spencer Speedway
officials. Brake fluid recirculating devices will NOT
Only one 12‑volt battery. Battery must be
located between the frame rails. Battery must be
securely anchored and mounted inside a spill proof
container located under hood or floor of the car. If
located under the floor, the battery must be completely
encased. If located under the hood, the battery must
have suitable cover. NO battery may be forward of
the radiator or rear of the rear end housing of the car.
Battery location must be acceptable to Spencer Speedway
16. ELECTRICAL SWITCH LOCATION
All electrical switches must be located
on the dash panel or within easy reach of the driver. A
labeled on/off master switch to the battery cable MUST
be installed on the cowl behind the windshield opening
on the right side of the driver. The switch must be
easily accessible and in plain view.
17. ENGINE COOLING SYSTEM
Engine cooling system must be acceptable
to Spencer Speedway. Icing, Freon type chemicals or
refrigerants may NOT be used in or near the
engine compartment. Portable cooling machines or devices
will NOT be permitted.
The transmission must meet the following
requirements: Only standard production OEM type Muncie
or T‑10 manual three (3) or four (4) speed transmissions
are permitted. May remove first gear and replace with
spacer. Automatic transmissions allowed. Only aluminum,
or steel transmission housings are permitted. Only OEM
type gears are permitted. All transmissions must have a
constant engagement of the input shaft with gear and
countershaft with cluster and reverse gears. Spencer
Speedway reserves the right to have all cars use a final
drive gear ratio within the limits set by Spencer
Speedway. Any method or transmission gear higher than
1.18 to 1 will NOT be permitted. The only high
gear transmission ratio allowed will be 1 to 1. A
forward gear and reverse gear MUST be in working
order. ONLY manual shift linkage is permitted on
the transmission. ONLY fire resistant type
shifter boots are permitted. The Jerico transmission
will NOT be permitted.
The engine‑cooling radiator must meet the
following requirements: Radiator must remain in front of
the engine. Radiator dust screens PERMITTED.
Radiator MUST be copper, brass or aluminum.
Radiator installation must be acceptable to Spencer
Speedway officials. Radiator overflow pipe MAY be
relocated and a minimum one (1) gallon overflow can.
NO anti‑freeze. WATER ONLY.
The clutch and clutch assembly must meet
the following requirements: Must be disc / pressure
plate design clutch assembly. NO coupler type /
Dog clutch or direct drives. Multiple disc clutches are
permitted. Minimum 7 1/4 inch diameter disc and using
one (1), two (2) or three (3) disc design. Limited to
magnetic steel discs, Steel or Aluminum pressure plates.
The disc clutch housing assembly or cover
shall be made from aluminum or steel ONLY. Any
single disc OEM production type clutch assembly, with a
minimum 10 1/2 inch diameter steel hub disc.
Clutch MUST be mounted inside an
approved bell housing.
21. DRIVE SHAFT
The drive shaft must meet the following
requirements: Drive shaft, universal joints and yokes
must be magnetic steel drive shaft and be similar in
design to standard production type. Only a one (1) piece
magnetic steel drive shaft will be permitted. It is
MANDATORY that two (2) 360 degree solid magnetic
steel brackets, NO less than two (2) inches wide
and 1/4 inch thick, be placed around the drive shaft and
torque arm and be fastened to the cross member of the
car. All drive shafts MUST be painted white or
22. REAR AXLE
The rear axle must meet the following
requirements: Aftermarket racing aluminum or steel
spool, axle shafts and gears are permitted. Clip in
axles MUST be welded in place. Aluminum or
magnesium quick change and non‑quick change center
sections equipped with aluminum or magnesium side bells
are permitted. If quick‑ change rear ends are used, only
those with magnetic steel spur gears on the back side,
jackshafts and axle tubes will be permitted. Quick
changes rear ends must have the gears in the rear of the
quick change. Front loaders are not permitted. Ring gear
in quick change and non quick change must not be smaller
than 10 inch. No mini quick change or non quick change.
ONLY locked rear drive axle assemblies are
permitted at all times during an Event. Limited slip
differentials are NOT permitted. For purposes of
checking a pre‑determined final drive gear ratio, when
jacked up both rear wheels must rotate in the same
direction with each traveling the same rotational
distance. The distance, measured from the center of the
rear end housing to the rear hubs, left and right, at
the point the wheels bolt on, must be within three (3)
inches in length. Only magnetic steel axle housings
permitted. The rear end must be mounted so that the
inside edge of the left rear tire is even with or
outside the outermost edge of the left side frame rail.
Spencer Speedway reserves the right to have all cars use
a final drive gear ratio within the limits set by
Spencer Speedway. If axle housing support bars are used,
they must not have any method of adjustment.
Quick change rear ends use a 4:86 or 5:04
gear. Non quick change use a 4:86 gear.
Sunoco fuel will the official fuel for
Spencer Speedway. Sunoco purple 110 fuel will be sold at Spencer
Speedway. There will be no mixing of fuel and no
additives added to the fuel. Fuel will be tested weekly.
Any fuel not meeting track
specs will be deemed illegal and you will be
All car owners in the Sunoco Mod class
is required to purchase
5 gallons of the Sunoco 110 fuel each
week, unless you are running a Crate engine. You need to
make sure a receipt is given to you for your purchase.
You will be asked for your receipt at some point during
the night so keep it handy. Your receipt will be
numbered and a copy will be kept in your file. You may
purchase a barrel of fuel and that will count towards
your weekly fuel purchase. If you are found not to have
purchased 5 gallons of fuel at the track each night you
could lose all money and points for that night, and a
fine may incur.
23. FUEL SYSTEM
Spencer Speedway will reject any fuel
cells, containers or check valves which appear to be
damaged, defective or do not function properly. Fuel
cell vent pipe check valves are compulsory. Pressure
systems will NOT be permitted. Any concealed
pressure type containers, feed lines or actuating
mechanism will NOT be permitted, even if
24. FUEL CELL
The use of a commercially manufactured
fuel cell is MANDATORY. The maximum fuel cell
capacity, including the filler spout and overflow, shall
not exceed 24 gallons. The nominal fuel cell dimensions
are 24 1/4 inches by 16 3/8 inches by 13 1/4 inches.
Materials other than standard foam, as provided by an
approved fuel cell manufacturer, are NOT
permitted. Fuel cell must be encased in a container of
not less than 22 gauge magnetic steel. Fuel cells must
be fitted within the container so that the maximum
capacity, including filler spout will not exceed 24
gallons. Fuel cell container size shall be 25 inches by
16 3/4 inches by 13 5/8 inches (inside dimensions)
Interior magnetic steel sheet metal must allow access to
top of fuel cell for inspection. Fuel cell and fuel cell
container must be installed as far forward as possible
in trunk compartment behind the rear axle and maintain a
clearance of five (5) inches.
Fuel cell container must be secured by one (1) inch by
one (1) inch by 0.065 inch minimum thick square steel
tubing meeting the ASTMA‑500 specifications or one (1)
inch by 1/8 inch thick magnetic steel straps two (2)
lengthwise and two (2) crosswise. The straps must be
located as close to the fuel filler check valve housing
25. FUEL FILLER VENT REQUIREMENTS
The maximum filler spout size is four (4)
inches by eight (8) inches by 18 inches.
26. FUEL CELL VENT (vented as follows)
A single, one (1) inch maximum vent to
outside of body at left rear corner. A fuel vent flap
valve must be used. The fuel cell check valve vent pipe
neck inside diameter shall not exceed one (1) inch
maximum. The fuel cell vent flexible hose shall have a
maximum inside diameter of 1 1/4 inches and a maximum
length of 60 inches when measured from the outside end
of the fuel cell check vale vent pipe to the top of the
fuel cell fill plate. A screen cap with a maximum
diameter of 1 1/4 inches may be placed over the vent.
27. FUEL LINES
Either (or both) right or left side
pickup in fuel cell may be used as approved by Spencer
Speedway. ONLY one (1) fuel line permitted from
fuel cell to fuel pump. All fuel lines are subject to
Spencer Speedway approval. The fuel lines from the fuel
cell to the carburetor may be relocated to prevent vapor
lock, but must remain under floor of car unless
otherwise approved. When the fuel line runs through the
right side of the driver’s compartment, it must be
enclosed in a one (1) inch outside diameter magnetic
steel tube. Spencer speedway approved check valve
mounted at the line outlet on the fuel cell is
recommended. Additional lines or extra length may not be
used on the fuel system, Extra fuel lines or fuel cells,
concealed or otherwise prohibited. It is recommended
that an on‑off switch be mounted within easy reach of
28. FUEL PUMP
Electric fuel pumps are not permitted.
Cooling of the fuel pump is not permitted. Only
mechanical fuel pumps in stock location permitted. No
29. ENGINE LOCATION
The engine location must be approved by
Spencer Speedway. The engine must be mounted between the
frame rails in front of the driver. The centerline of
the crankshaft when measured to the center of the lower
ball joint, left and right, must be within two (2)
inches in distance. Engine minimum crankshaft center to
ground clearance is 9 1/2 inches. The engine may NOT
30. ENGINE GROUND CLEARANCE
Engine ground clearance will be measured
(with driver in car) at the oil pan. A minimum height of
two (2) inches from the bottom of the oil pan to ground
MUST be maintained at all times.
31. ENGINE MOUNTS
All engine mounts shall conform to the
following requirements: Engine mounts must be reinforced
and must be acceptable to Spencer Speedway. All engine
mounts MUST be securely bolted.
32. ENGINE DISPLACEMENT/COMPRESSION LIMIT
Only "small block" V‑8 engines with a
minimum of 350 cubic inch displacement will be allowed.
To clarify the identification of a "small block" engine,
listed below are the basic engines designated and
approved as "small block" engines. Any engine NOT
listed will be designated as a large block engine and
will NOT be permitted, regardless of the engine
Maximum engine displacement as follows:
1. GENERAL MOTORS 350 CU. INCHES
2. FORD 351 CU. INCHES
Engine displacement may be increased by
boring. Formula for determining cubic inch displacement:
Bore x Bore x .7854 x Stroke equals cubic inch
displacement of each cylinder. The cubic inch
displacement of each cylinder added together will
determine the total cubic inch displacement of the
COMPRESSION LIMIT: The maximum
compression limit allowed shall be 11.0 to 1 on any
cylinder. When calculating the compression ratio, an
allowance of one (1) cubic centimeter will be added to
the volume for the area around the top of the piston
down to the top of the piston ring that will be sealed
with grease. * The procedure for checking compression is
as follows: Bore x Bore X .7854 x Stroke equals the
Cylinder Volume of each cylinder at Bottom Dead Center (bdc)
in cubic centimeters. The cylinder head pour volume
minus(‑) the known volume of the cylinder head plate
plus (+) head gasket volume plus (+) 1.00 cc for sealing
piston ring plus (+) the cylinder block volume minus(‑)
the known volume of the block plate equals(=) chamber
volume. (Compression ratio = Cylinder Volume plus (+)
Maximum compression ratio 11.0 to 1, 2600
lbs. after race. 9.6 to 1 maximum will be given a weight
break of 50 lbs. for a total weight of 2550 lbs. after
race. Compression will be checked with a whistler. V‑8
engines only. NO aluminum engine blocks or heads.
GM Chevy 350 cu. In standard production
block with stock external and internal measurements.
Bore size of 4.00 to 4.060 only (+.005 tolerance)
Bowtie Block # 124800474 allowed. Dart
block part # 3116111 will be allowed.
Block must be centered between frame rails and not
tilted. Must be securely mounted to frame. Center of
crankshaft must be within 2‑inch center of thread width.
Only stock production type crankshaft can
be used. Standard steel or cast iron. Aftermarket
crankshafts must be identical to stock OEM in
appearance, construction, weight and journal size.
Counterweights must be the same shape and size of stock
OEM crankshaft. Minimum crankshaft weight 48 lbs.
Chevrolet must use LARGE journal size crankshaft.
Stroke 3.480 only (+ or ‑ .005). Counterweights must
remain stock. No undercutting. No knife edging,
tapering or altering in any weigh. Except for normal
balancing, by drilling, turning, or adding #. Rod
journals stock diameter with tolerance of .020 Light
deburring permitted, however forging or casting flashing
must remain. Harmonic balancer minimum diameter 6.25
inches. Fluid dampener is legal. Centerline of
crankshaft minimum 9 ½ inches from the ground.
OEM stock rods or aftermarket rods.
Machining for bushing or full floating is allowed. 5.700
or 6.000 forged or billet connecting rod permitted, for
Chevrolet. Aftermarket 5.700 forged or billet minimum
weight 575 total grams. Aftermarket 6.000 forged or
billet minimum weight 600 total grams. Maximum Ford rod
length 6.000. NO
de‑burring, de‑flashing, polishing abrasive cleaning or
lightening. NO titanium, aluminum, max‑light
aerospace alloy rods allowed.
Flat top or dished aluminum three ring
pistons only. All three rings in place. Valve relief’s
may be machined in pistons. Any steel pin may be used.
492, 462, 461, and 461x type heads
Heads must be any 23‑degree, unported
cast iron, from listed manufacture.
Chevrolet – World casting #011150 –Angle
plug, #011250 –Straight plug
Proaction #2234‑00000A – Angle plug,
#2234‑00000 – Straight plug
Proaction #12320 Angle Plug, #12319
Ford #M‑6049‑N351, N352
GM Cast bowtie heads #’s, 10134392,
Dart Iron Eagle Platinum Series Heads will be allowed
with a +50lb weight addition. (2017) 2600lbs + 50lbs =
Weight MUST be put on hood or subject to
*These heads are subject to all other head rules.
ONLY Dart Iron Eagle Platinum Series Heads allowed:
#10310010P - Straight plug bare
#10311112P - Straight plug assembly
#10320010P - Angled plug bare
#10321112P - Angled plug assembly
Maximum intake runner 200cc
Maximum intake runner volume of 200
cc’s. No porting to reach maximum runner volume. NO
G.M. VORTEC CYLINDER HEADS OF ANY TYPE.
Heads must retain stock internal,
external measurements. No port matching, blending,
porting, polishing, removal or addition of materials to
head. No hand grinding or acid dipping permitted on any
part of the head. No paint, epoxy fillers, welding or
spray welding on heads. External painting to match
engine allowed. Manufacturers spec and intake runner CC
size will apply on all heads listed. NO TOLERANCE.
a. All valves must identical in
appearance in construction as OEM type valve. Minimum
valve stem diameter 11/32 inch. Valve stem diameter may
be undercut to a minimum diameter of 15/16 inch in the
area of the valve stem from the head of the valve to the
bottom of the guide.
b. Valve must be solid stainless
c. Valve springs and push rods
must be magnetic steel only.
d. Screw in studs allowed.
e. Roller rockers and girdles are
allowed. No shaft rocker arms.
f. Chevrolet intake valve 2.020
exhaust valve 1.600.
g. Ford Windsor intake valve 1.844
exhaust valve 1.546.
h. Ford Cleveland intake valve
2.046 exhaust valve 1.546.
i. Ford #M‑6049‑N351 intake valve
2.020 exhaust valve 1.600.
j. ½ inch under valve seat to
complete valve job allowed. Machine cut only. No
polishing or blending.
k. Heat risers can be filled.
l. Multiple angle valve job with
valve centerline and guide angle in OEM stock location
in relationship to the head.
m. No combustion chamber
n. No repositioning head on block.
Stock location only.
SPEC CYLINDER HEAD OPTION
Dart part number 10024266
cylinder head casting must be used for this option. The
casting part number must be as produced by Dart, custom
ordering of partial production/finishing is not
a. The Dart casting is produced with, and must maintain
a minimum 60cc combustion chamber, a 2.02” intake valve and a
1.60” exhaust valve.
b. Machining the valve guide bosses for seals and
machining the gasket surfaces is permitted.
c. The addition of screw-in studs, guide plates, valve
spring seats, valve seals, poly-locks or jam-nuts is
d. Coolant lines are permitted on the front/rear ends of
the heads. Coolant lines are not permitted on the side
of the head.
e. Max Intake port volume is 177cc. Max Exhaust port
volume is 71cc.
f. Head gasket surface milling tolerance is 0.00″ to
0.050″ from true 23.00 degrees of stock valve position.
g. The Intake to pin measurement must be no less than
6.050”. No other machining or modifications of any kind
h. The ports/runners, combustion chamber, the valve
angle and location must remain as produced by Dart.
i. The EGR port may be blocked off at the intake gasket
area only, by use of a metal shim on one surface of the
j. A maximum of 2 intake mounting holes may have HeliCoils. Intake and exhaust mounting holes may not be
added or relocated. Holes must take standard dimension
VALVES - The Manley intake valve #11596 (111 grams),
Manley intake valve #11864 (114 grams), Manley exhaust
valve #11543 (95 grams) or Manley exhaust valve #11863
(102 grams) must be used. Valve stems must have a
minimum diameter of 11/32 inch. Valve lifter weight is
85 grams minimum. All parts must maintain production
dimension and weight.
VALVE JOB - When cutting the valve seat angles, no stone
or grinding marks are permitted above the bottom of the
valve guide. All cutting in reference to the valve job
must be centered off the centerline of the valve guide.
Competition style multi-angle valve job is permitted.
The bowl area must pass the 360 degree “ball” check (the
appropriate sized ball must not fall into the guide area
when rolling around on the valve stem). Intake is a
.787” ball. Exhaust is a .531” ball. Surfaces and/or
edges where the cutter or stone has touched must not be
polished. No hand grinding or polishing is permitted on
any part of the head.
VALVE SPRINGS & RETAINERS - OEM Stock type magnetic
steel retainers that weigh a minimum of 30 grams
(retainer only) must be used. Valve springs may be
single or double springs, but must be parallel wound.
Barrel wound, conical wound springs, or beehive type
springs are not permitted. Double springs must have a
diameter between 1.450” and 1.437”. Valve springs must
have a height of 1.700” to 1.800”. Retainer locks must
be magnetic steel, and must be Machine 7 degree, Super 7
degree, or 10-degree types only.
ONLY LEGAL INTAKE MANIFOLD FOR THE SPEC HEAD OPTION WILL
2nd Gen Edelbrock #7101 intake manifold.
a. There are no modifications or alterations permitted
to the intake manifold.
b. No porting, polishing, acid dipping, deburring,
de-flashing, abrasive cleaning, internal painting,
milling, cutting, drilling holes, enlarging bolt holes,
matching of ports or welding.
c. All bolt holes must be in alignment and same size as
d. Coolant lines are only approved from the water neck
to the back side of heads.
e. The maximum thickness allowed for the Intake gasket
f. Officials reserve the right to swap competitors
intake manifolds at any time as part of their routine
post-race tech process.
ENGINE MUST STILL ADHERE TO RULES 35 and 36 and maintain
Flat tappet camshaft only. NO
roller camshaft. NO mushroom or roller lifters.
Lifters must be stock diameter. No roller camshaft
Any timing chain and gears may be used.
Degree bushing and offset crank gear keys may be used.
Gear drives may be used.
Roller rocker arms permitted. NO
shaft mounted roller rocker systems.
Magnetic steel valve push rods are
34. ENGINE LUBRICATION
A. OILING SYSTEM
Internal oil pumps driven from the
distributor are required.
B. OIL PANS
Magnetic steel oil pans only.
C. OIL PAN INSPECTION PLUG
Is required on the left side of the oil
pan. The inspection hole must be a minimum of 1 1/4 inch
I.D. It must be 9 1/2 inches from the rear block face to
the centerline of the inspection hole or 4 1/2 inches
from the front block face to the centerline of the
inspection hole and 1 1/4 inches from oil pan rail.
There will NOT be any obstruction of view from
the inspection hole to view crank and rods.
D. VIBRATION DAMPER
Stock‑type steel or cast iron. NOT
to be machined or altered in any way.
Battery operated ignitions only. Stock
type point distributor or electronic ignition allowed.
NO ignition boxes or multi‑spark systems.
Aftermarket coils must fit in stock location. May use
aftermarket H.E.I. stock replacement type distributor.
MSD H.E.I. # 8365 permitted.
F. WATER PUMPS
Only OEM type steel or aluminum
mechanical water pumps in stock location, turning in the
same direction of the crankshaft rotation, are
permitted. Water pump impellers may be altered but
coolant flow must be in the same direction as the
Unaltered HOLLEY #4412‑500CFM only. HP
Must be approved by SPENCER SPEEDWAY
officials. Choke horn may NOT be removed.
Boosters may NOT be changed Booster size or shape
may NOT be altered. NO sideways
carburetors allowed. Venturi area must NOT be
altered. Casting ring must NOT be removed. NO
grinding or polishing. NO modifications to the
base plate. Throttle shafts must remain standard and
must NOT be thinned or cut. Stock butterflies may
be drilled for idle holes but must not be thinned or
tapered. Removal of the choke plate and choke linkage.
Changing of jets accelerator pump nozzle, pump cam and
power valves permitted. Alterations to allow additional
air to be picked up below the opening of the venture
such as altered gaskets, base plate or drilling holes
into the carburetor will not be permitted. No epoxy
36. CARBURETOR ADAPTOR PLATE / SPACER
Only one solid spacer made of aluminum or
pheonolic plastic of a maximum height of one (1) inch
permitted. Only one .075 maximum gasket per side. NO
wedge shaped mounting surfaces, both top and bottom
surfaces must be parallel. Spacer must have 2 holes
maximum size 1.750 straight bore and match the base of
No air flow modifications.
37. CARBURETOR THROTTLE
All linkage must be mechanical type.
NO cable type. Two springs MANDATORY.
Toe strap MANDATORY.
38. AIR CLEANERS AND AIR FILTERS
MAXIMUM OF 5 INCHES IN HEIGHT. All
air must be filtered through the element. Top of the air
cleaner must be solid with NO holes. Top and
bottom of the air cleaner must be of the same diameter.
NO air induction, ducts, baffles, tubes,
which may control the air leading to or
through air filter, or inside
air filter to redirect air into carburetor.
The filter base must have a minimum round opening of 5
inches.. It will be permissible to shield the front area
of the air cleaner up to a maximum of one‑half of the
air cleaner circumference and no wider than the height
of the element. A one (1) inch maximum height spacer may
be used between the carburetor and the air cleaner. K&N
Plastic top and Bottom ARE NOT Allowed.
Only paper air filters will be allowed.
39. INTAKE MANIFOLD
FORD‑#M‑9424‑C358 EDELBROCK # 2181
EDELBROCK # 2750
NO alterations or modifications to
manifolds allowed. NO coatings allowed on or in
manifold with the exception of paint only on exterior
surfaces. Identification in the form of cast‑in part
numbers must remain unaltered on the manifold.
40. EXHAUST SYSTEM
(officials reserve the right of reject
improper mounted exhaust systems) Exhaust headers must
be a commercially manufactured header using a steel
primary tube size of 1 5/8 inch minimum and a maximum of
1 3/4 inch outside diameter. 1 5/8" to 1 3/4" step
header permitted. Must be a conventional four into one
collector with a maximum size of 3 1/2 inch OD. Maximum
header flange will be 3/8 inch. NO header plates
between heads and headers. NO adjustable headers.
NO inserts allowed in any part of the header or
collectors. NO 180 degree headers. NO
stainless headers. NO merge. NO pyramid.
No Try‑y or similar style collector permitted. NO
exhaust pipes allowed in driver's compartment. NO
thermal wrap permitted on headers. NO crossover
pipes permitted. All exhaust pipes must be a single
round steel 3 1/2‑inch pipe, with muffler.
41. HEAT SHIELDS
Heat shields to cover exhaust manifold
can be NO more than six (6) inches wide and NO longer
than the valve cover.
No car will be allowed to race without
mufflers. No modifications of any type allowed on
The ONLY legal mufflers will be:
Lobak part #’s 30 12 30, 35 12 35 3” or 3 ½”
inlet/outlet with 12” body, Kooks #R300-10 or Kooks
Stafford Spec #R35-35-10. MUFFLERS
MUST BE REMOVABLE FOR INSPECTION.
All cars must
be a maximum of 95 decibel checked from the center of
the track. 95 D.B.A. is MANDATORY. Muffler
falling off car may result in immediate
The wheels must meet the following
requirements: Only 15 inch diameter five (5) lug
reinforced magnetic steel racing wheels with a maximum
width of 13 inches are permitted. 12 inch maximum is
recommended by most tire manufacturers. Any offset is
permitted. Wide five bolt pattern OPTIONAL. Bead
locks are NOT permitted. Maximum tread width is
84 inches measured from outside to outside tire.
44. LUG BOLTS AND NUTS
Solid heavy‑duty 1/2 to 5/8 inch magnetic
steel lug bolts and standard one (1) inch hex by 1/2 to 5/8
inch thick magnetic steel lug nuts. Lug stud threads must go
through the full thickness of the wheel nut on all four (4)
A. Only "track-plated" American Racer
Tires 27.0/10.0-15, 26.5/10.0-15 & 26.0/10.0-15, EC-31 will be used.
B. Durometer of tires will be checked. The only approved durometer will be the Spencer Speedway official
instrument A tire minimum softness may be declared at the
beginning of a race event. Durometer readings may be taken
after racing competition or in the line up staging areas,
any tire not meeting the specification will be determined
illegal, disqualified and lose all points and money for the
night. Tires found illegal will become the property of
Spencer Speedway. Any competitor found with illegal tires a
second time will be disqualified and subject to possible
suspension from Spencer Speedway, fines may incur. Any
competitor purposely avoiding a Spencer Speedway official by
running through the dirt, water, taking extra laps around
the track, etc.. will be determined to have illegal tires.
NO use of bleed‑off or pop off type valves. Hand
grooving, buffing, grinding and/or cutting on any area of
the racing tire will NOT be permitted. Tires that
have been altered by unauthorized treatment will NOT
be permitted. All decisions by Spencer Speedway officials
will be final.
be purchased only from the Chemung Speedrome or Spencer
Speedway and scanned/logged into a Drivers Common Tire
Inventory for both tracks to be legal. Tire purchases prior
to the first scheduled race of the season may be made at
Chemung Speedrome or Spencer Speedway. All tires in inventory,
NEW or USED, must have been/be purchased at Chemung
Speedrome or Spencer Speedway for use at either track.
Each tire will carry a special bar coded serial number. The
legibility of the bar code is the sole responsibility of the
driver. This number will be scanned/logged into a drivers
common database designating it as a tire for use at Chemung
Speedrome or Spencer Speedway. Each scanned/logged serial
number will be placed in that Drivers Common Tire Inventory
that will be assigned to the driver that the tires have been
In the event a driver changes cars for qualifying or feature
racing, the Drivers Common Tire Inventory must accompany them
to the new car. Each driver must keep their Common Tire
Inventory current with Track Officials.
If a tire cannot be identified, it will be considered
illegal. Chemung Speedrome or Spencer Speedway Officials may
confiscate and/or impound tires at any time for inspection.
FULL AMERICAN RACER TIRE PROCEDURES
The JTR Eagle PPM Tester will be set at a fixed level and
will be strictly enforced throughout the 2017 season.
NO SOAKING, SOFTENING OR TREATMENT OF TIRES ALLOWED
NOTICE: A participant competing in any race at Chemung
Speedrome/Spencer Speedway specifically agrees that he/she
acknowledges it is illegal to soak or treat racing tires and
that said soaking or treatment of racing tires is subject to
disqualification from race, forfeiting of the event points
and monies of that race, forfeiting all previous points
earned that season and subject to suspension, determined by
Chemung Speedrome/Spencer Speedway Officials.
EVERY COMPETITOR MUST MAKE THEMSELVES AWARE OF AND FAMILIAR
WITH THE TECHNICAL RULES IN THIS CLASS. EVERY INDIVIDUAL
AGREES TO BE KNOWLEDGEABLE AND BOUND BY THE CONTENTS OF THE
SPENCER SPEEDWAY SUNOCO FUEL WEEKLY MODIFIED RULE BOOK.