Notice: All components are subject to inspection and approval of
Track Officials. No equipment will be
considered as having been approved by reason of having passed through
inspection unobserved. ALL RULES WILL BE
INTERPRETED BY TRACK OFFICIALS. IF YOU HAVE ANY QUESTIONS ABOUT RULES, CALL
BEFORE BUILDING CAR.
This class is for all 010 Limited Modified to go
in. Just change the body and motor down
and run.
FRAME:
Mid-size GM 1978-1987 metric full frames only with
108” wheelbase as per OEM stock specifications; all frame bolt holes must
remain in stock location. Wheelbase may be minimum of 107” and maximum of 109”.
WEIGHT:
Minimum weight is 2450 pounds with driver after race.
All added weights must be painted white with car number clearly marked. Also
all weights must be attached with a minimum of 2 (two) ½” steel bolts and
mounted under body to frame rail. No mounting of weights on bumpers. Loss of
weight could result in fine from the track if deemed necessary.
ENGINE:
1. Maximum cubic inches = 305 or 350 plus over bore. If running 350 must add 50 lbs. in front of
motor plate. V-8 blocks and heads only. Small blocks only. No special order
blocks.
2. No Bowtie, Dart or aluminum blocks. No big blocks.
3. Flat-top with four equal valve relief or dished
CAST pistons only. Press fit only. NO floating pins
4. Decking OK.
5. Stock OEM 305 or 350 or aftermarket cast
replacement crankshaft for block used, stock stroke and stock OEM rods. No steel cranks. Maximum of a 5.7” rod length and 3.48 stroke
for GM 305 cu. In engines (aftermarket stock replacement cranks are allowed).
No machining of any cranks other than balancing. No lightening.
6. Aftermarket rod bolts, main bolts, and head bolts
are allowed. No studs.
7. Stock or circle track claimer pan is allowed. Oil
pan must have one (1) inch inspection plug between the second and third (from
the front), oil pan bolts either side will be fine. NO PLUG NO RACE
8. Fluid damper is allowed.
9. Any water pump.
10. Aftermarket starters, mini starters OK.
11. Steel side engine mounts may be stock or 45-degree
style.
12. Engine mid-plate is allowed. May be aluminum.
13. Engine must pull 12 inches of vacuum at 1200 rpm
and not more than 180 psi compression with five starter hits.
14. Oil pan must have one (1) inch inspection plug
between the second and third (from the front), oil pan bolts either side will
be fine. NO PLUG NO RACE
NO ENGINE PARTS TO BE SPECIAL ORDER PERFORMANCE PARTS
LOCATION:
1. Back of engine flange must be mounted at a minimum
of 70” forward of the centerline of the rear axle. This will be measured on the
passenger side of the car.
2. Minimum engine height is 11” from the ground to the
center of the crankshaft This will be measured on the front of the crankshaft
pulley.
CAMSHAFT:
.450” maximum lift. Hydraulic lifter cams only.
Hydraulic lifters only. No roller hydraulic lifters. Anti-pump up lifters okay.
No gear drives. Maximum of 4 bronze bushings in the lifter bores. Must pull 12
inches of vacuum at 1200 rpms.
CYLINDER HEADS:
1. Only OEM cylinder heads 305 or 350 1986 or newer
heads only. No vortex. No other heads allowed, documentation required. If you are unsure, ask before you buy.
2. No porting, polishing, or port matching allowed.
Screw in studs are allowed. Stock spring diameter only, with a maximum of 120
lb. seat pressure. No guide plates.
3. Heads may be flat milled. Minimum of 57 cc is
required.
4. Stock stamped steel rocker arm only. No full roller
rocker arms or roller tip rocker arms.
5. Maximum valve size: GM 194 intake, 1.5” exhaust.
Poly-locks are allowed. Stud girdles are not allowed.
6. NO aluminum or titanium components.
7. Most breather/valve cover configuration/composition
are allowed. No ram air.
INTAKE:
1. GM: stock, OEM cast iron is required. No machining
of intake, no extra water lines or any other add ons.
2. No high riser, no marine or Bowtie, no tall
intakes.
3. No Brzezinski, porting, polishing, acid dipping, or
anything similar allowed.
CARBURETOR:
You may only run one carburetor on intake.
1. Holley #4412 two barrel. Only
2. Carburetor spacer/adapter is allowed, but must not
exceed 1” total thickness, gaskets not to exceed ¼” inch.
3. Carburetor must be stock and unaltered with only
one exception; circle track floats may be used. Holley must have choke horn
attached.
4. No Edelbrocks or similar high-performance
carburetors allowed.
5. Gasoline only.
IGNITION:
1. All cars must have ignition switch clearly labeled.
2. Ignition switch must be located within reach when
standing outside the car (easily accessible to emergency personnel).
3. Stock or stock style ignitions only.
4. HEI must remain in one unit. NO external coils
allowed.
5. MSD or any module may be used as long as it fits
inside the distributor with no alterations. Vacuum advance may be removed and
the pick-up coil locked.
6. MSD, any brand, or GM electronic boxes are not
allowed. No magnetos.
Only one 12-volt battery allowed. Must be securely
mounted. Subject to tech inspection! May be charged by an alternator.
EXHAUST SYSTEM:
MOST, 1 5/8” tube, 4 into 1 with 3” collector,
one-piece header. 180 degrees allowed. Headers must bolt directly to the head
with no modifications or adapter. No step headers. If you are unsure, ask before
you buy.
RADIATOR:
1. Only one radiator allowed and must be mounted in
front of engine. May be aluminum. Maximum size: 27” x 19”.
2. Racing radiator cap allowed.
3. Electric cooling fan in front of radiator allowed.
May not have water outlets to spray on radiator. Catch cans are required.
FUEL:
Gasoline only. No alcohol. No nitrous. No other
performance enhancers allowed.
FUEL PUMP:
O.E.M. style non take a part fuel pump only. NO
electric fuel pump. Only stock mounted, push-rod activated, lever type allowed.
No bypass fuel systems, pressurized, or return lines allowed. No regulators of
any type. No bolt together pumps.
FUEL CELL:
1. Maximum 22 gallon fuel cell with a rollover valve
is required. Must be securely mounted inside trunk area only, must be between
frame rails and must be totally enclosed from the driver’s compartment. A
minimum of 2 fuel cell straps, 2” x 1/8”, are required to secure the fuel cell.
2. Fuel cell protection bar is required. Must be a
minimum of 1 ½” x 0.095”. It must protect the fuel cell from the rear. It must
be as low as the fuel cell, and extend from side to side as wide as the fuel
cell. It is recommended that this bar be attached to the frame, not the bumper.
If the fuel cell protection bar is not present, the car will not be allowed to
continue running.
TRANSMISSION:
1. Most OEM automatic transmissions are allowed. Power glides OK. They must be stock and have a full working
steel torque converter, minimum of 10.” NO direct drives, couplers, valve
pumps, or bleeder style valve bodies. Transmissions must have all forward gears
and reverse gear must be in working order.
2. Car must be self-starting and have working neutral,
reverse, and forward.
3. Transmission fluid coolers are allowed.
4. Standard transmission are allowed
5. OEM flywheel ONLY. No small fly wheels. Auto and standard. No lightweight flywheels.
DRIVE-SHAFT:
Drive-shaft must be steel and must be painted white or
silver, or fluorescent orange. Must have a steel drive-shaft loop (360
degrees), connected to the frame located within 6” of the front drive-shaft
ujoint. Minimum size is 2” x ¼” or a minimum of 1” O.D. tubing. No chain loops
allowed as front loops.
REAR END:
1. Rear end must be 7.5” GM 10-bolt with stock width.
Aftermarket axles, studs, and mini-spools are allowed. No posi-trac, limited
slip style rear ends. Rear end axles must be locked together at all times.
2. A method to restrict axles from coming out is
mandatory. C-clip eliminators or disc brakes permitted.
3. Any gear ratio may be used, if no alteration to
housing is required.
4. Bolt pattern on the axle/drum may be changed.
Pinion angle may not be altered at all.
BRAKES:
1. Single or dual master cylinder aftermarket brake
pedal is allowed. Pedal adjuster is allowed within drivers reach.
2. Rear disc brakes maximum of 12” steel hats and
rotors. No single-phase rotors allowed.
3. A proportioning valve may be used and may be
installed within the driver’s reach.
4. Minimum of 3 working brakes is required. If using 3
brakes, the fourth brake components need not be present. Spindle must remain
unaltered.
5. Cooling holes may not be drilled in any brake
components.
6. No aluminum brake components allowed.
STEERING:
1. Quick release steering wheel is mandatory.
2. Quick steer is optional. No chains or sprockets
allowed in the steering system.
3. Steering left of drive train only.
4. Bump steer cannot be adjusted. Center link, inner
tie-rods, outer tie-rods, or sleeves cannot be altered.
5. Power steering is allowed.
6. Aftermarket power steering pump may be used; pump
and reservoir must remain one unit.
7. No rack and pinion steering. Stock OEM steering
gear box must be used.
SUSPENSION:
1. Upper control arm brackets may be moved for caster
and camber adjustment.
2. Must use stock upper control arms and brackets.
3. Upper and lower control arms bushings may be
aftermarket.
4. Sway bars and brackets must remain stock. Bushings
may be aftermarket.
5. Racing springs are allowed. Steel only. No
coil-overs. No jack bolts allowed. Adjustable spring buckets are allowed.
6. Spindles and rotors must remain stock. Ball-joints
must remain stock appearing, size and length. No grinding or lightened parts.
Lower ball-joint may be large size and welded in.
7. No drilling cooling holes in rotor. 5/8” studs are
allowed in any bolt pattern.
8. Rear trailing arms must remain stock for frame
used. Must remain stock length. Must not compress or lengthen. Arms may be
boxed or strengthened. Aftermarket OEM style bushings may be used. NO
spherical, ball bearing or Timken bearings as any part of the cars suspension.
Each trailing arm must have all bushings installed and in good working order.
9. No suspension parts may be altered or lightened.
10. No aluminum parts allowed, other than bushings.
SHOCKS:
1. Stock shocks or steel body race shock OK.
2. The stock shock frame mounts must be used in the
original stock location.
3. One shock per wheel.
FRAME:
1. Frame cannot be cut, bent, or altered to change
suspension brackets.
2. Front frame horns can be cut off in front of the
steering box/idler arm.
3. Rear frame rails may be cut off behind upper shock
mounts.
4. Replacement may be made with round, square, or
rectangular tubing.
ROLL CAGE:
1. Main roll cage must consist of continuous hoops not
less than 1 ½” x 0.095”. All welds must be complete. NO brazing or soldering. NO
part of main cage may extend past rear motor plate to the front. The main roll
bar must not attach to the frame past the front edge of the rear tire.
2. Main roll bar and halo must be a minimum of 1”
above the driver’s helmet.
3. A minimum of 3 driver side door bars, and 2
passenger side door bars is required.
4. Two (2) bars, one per side, may extend from the
main roll cage to points on the main frame in front of the upper control arms.
These bars may have 2 additional braces per side to the main frame.
5. Four (4) bars may extend from the main cage to
rear, 2 to the main frame and 2 to the upper shock mount area. In addition,
X-bracing is allowed.
NERF BARS:
One single nerf bar between the front and rear wheels on
each side of the car is allowed. Maximum size is 1 ½” x 0.095”. They are to be
attached to the cage at the front and rear sections of the nerf bar. No center
supports are allowed on the nerf bar. Ends must be capped and may not extend
outside of tires.
WINDSHIELD BARS:
Minimum of 3 vertical windshield bars 5/16” in
diameter is required. Must be mounted in front of driver.
TIRES:
AR kk704 or Hoosier g60, hard only
WHEELS:
1. Only steel 15” x 8” or steel 14” x 8” wheels are
allowed. Right rear beadlock allowed.
2. No wheel spacers allowed. Any offset wheel allowed.
5/8” studs are allowed.
3. One inch diameter lug nuts are required.
4. Maximum tire width 76”
INTERIOR:
Oil and transmission fluid coolers are not allowed in
the driver’s compartment.
UPHOLSTERY:
1. No upholstery allowed, other than driver’s seat
cover.
2. No plastic is allowed in driver’s cockpit.
FLOOR:
Must be metal. Must cover the entire driver’s cockpit.
BUMPERS:
1. Two (2) bar front bumper is mandatory. Minimum size
is 1 ¼” x 0.095”; maximum size is 1 ½” x 0.095”.
2. One single bar rear bumper is required. Maximum
size is 1 ¾”. The required fuel cell protection bar (max. size 1 ½” x 0.095”)
may be attached to the rear bumper.
DRIVER RESTRAINT SYSTEM:
Seat:
Aluminum
racing seat with right side rib protection is required. A set that provides
both left and right side rib protection must be securely mounted. The racing
set must be bolted to a reinforced cross-member and bracket(s). This cross-member must be welded to the roll
cage, not just the floorboard. The back
of the seat must be supported and bolted to a flange that is connected by weld
to the cage.
Seat
Belts:
1.
Racing type 5-point seat belts are mandatory.
Must be approved 3” wide shoulder straps and a minimum of one 2” sub
strap. All belt systems must be securely
attached to the roll cage or seat cross-member and not to the floorboard.
2. Seat belt dates must be current up to a
maximum of 5 years old. If the date is
not visible, the belts are not approved.
Window
Net:
1.
A window net is mandatory. It may be the mesh or web style. Sprint car nets are allowed.
2.
A quick release window net system must be used.
Helmets:
Approved
racing helmets only: full face Snell SA90
or newer. It must have Snell SA90, SA95,
or SA00 sticker clearly visible in the helmet.
If the Snell rating decal is not visible, then the helmet is not
approved. No DOT only helmets.
Protective
Clothing:
1. Driver suit (fire suit) mandatory; may be one
piece or two piece; must be complete and be of fire resistant material and in
good safe condition.
2. You must wear the complete uniform and
helmet, anytime the car is on the racetrack, due to insurance regulations.
3. Driving gloves and shoes are required.
4. Neck brace is mandatory for drivers.
5. Driving gloves and driving shoes are required.
BODY:
Must be late model body.
BODY SUPR rules apply with the exception of
1. Only the large SUPR spoiler
2. From center of front hub to front of nose max is
48”
3. Max wheel base is 107” – 109” same as limited
4. Doors cannot exceed 80” width at the bottom side to
side
Most other SUPR body rules apply. These can be found at http://www.suprracing.com/Rules.htm