Notice: All components are subject to inspection and approval of Track Officials. ALL RULES WILL BE INTERPRETED BY TRACK OFFICIALS. IF YOU HAVE ANY QUESTIONS ABOUT RULES, CALL BEFORE BUILDING CAR.

BODY

Must be limited modified body with no roof and no spoiler.

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".

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.

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 loss of points if deemed necessary.

ENGINE

1. Maximum cubic inches stock 305 or 350 plus over bore. V-8 blocks and heads only. Small blocks only. No special order blocks. 364 cubic inch maximum.

2. Flat-top with four equal valve relief or dished CAST pistons only.

3. Decking OK.

4. 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.

5. Aftermarket rod bolts, main bolts, and head bolts are allowed. No studs.

6. 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

7. Fluid damper is allowed.

8. Any water pump.

9. Aftermarket starters, mini starters OK.

10. Steel side engine mounts may be stock or 45-degree style.

11. Engine mid-plate is allowed. May be aluminum.

12. 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

.460" 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 16 inches of vacuum at 1200 rpms and not more than 160 psi compression with five starter hits.

CYLINDER HEADS

1.  OEM cylinder heads 305 or 350 1986 or newer heads . No vortex. No other heads allowed, documentation required. If you are unsure, ask before you buy. Legal head number 997,445,882,624,441,993,185.Any open chamber OEM head.

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. Guide plates allowed

3. Heads may be flat milled. 

4.  No full roller rocker arms allowed.roller tip rocker arms will be allowed. 

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 or 0-80583-1.

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. Carburetor check top and bottom with go-no-go gage.

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.

BATTERY

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 or racing fuel only.

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 Saginaw, Muncie and Borg-Warner or factory OEM GM, only with 12" clutch no light weight clutch or pressure plate or flywheel. Transmissions must have all forward gears and reverse gear must be in working order.

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. Aftermarket power steering pump may be used; pump and reservoir must remain one unit.

6. Stock OEM steering gear box must be used.

SUSPENSION

1.IMCA tubular upper control arms allowed.(steel only and must be IMCA stamped -not adjustable.) Upper control arm brackets may be moved for caster and camber adjustment.Cannot move lower A frame.Must use stock lower control arms and brackets.Upper mounts may be modified but must remain stock material.Upper and lower control arm bushings may be aftermarket.
 

 Sway bars and brackets must remain stock.

 Racing springs are allowed. Steel only. No coil-overs. No jack bolts allowed. Adjustable spring buckets are allowed.

 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.

 No drilling cooling holes in rotor. 5/8" studs are allowed in any bolt pattern.

 Rear trailing arms must remain stock for frame used. Must remain stock length. Must not compress or lengthen. Arms may be boxed or strengthened. OEM style bushings only. 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.

 No suspension parts may be altered or lightened.

 No aluminum parts allowed, other than bushings.

SHOCKS

1. Stock shocks only for GM 1978-1987.

2. The stock shock frame mounts must be used in the original stock location.

3. One shock per wheel.

4.  Spring spacers are allowed.
 

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

American Racier KK704 or Hoosier G60, hard only, no less than 50 durometer 

WHEELS

1. Only steel 15" x 8" or steel 14" x 8" wheels are allowed. Right rear beadlock allowed.

2. Wheel spacers are allowed. Any offset wheel allowed. 5/8" studs are allowed.

3. One inch diameter lug nuts are required.

INTERIOR

Oil and transmission fluid coolers are not allowed in the driver’s compartment.

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

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.

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. Arm restraints mandatory.

WINDOW NET

A window net is mandatory.

HELMET

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 and arm restraints is mandatory for drivers.

*** General Rules for Track also apply to this class.***