9.1.1           DEFINITION

9.1.1           The word stock will mean unaltered as originally factory produced and installed for make and model. All cars and trucks will be stock unless otherwise specified in these rules. In the case of a car having a body that is of a model other than the model of the chassis; Stock will mean unaltered as originally factory produced and installed for the make and model of the chassis when chassis items are in question and vise versa when body items are in question.

9.2                COMPETING MODELS.

9.2.1           1955 or newer standard sized American made cars, trucks, coupes or wagons. Two seat models not approved.

9.3                MINIMUM WEIGHTS – post Event

9.3.1           Minimum total weight as weighed with the driver will be 3,300 lbs. (post race, post qualifying)

9.3.2           Maximum left side weight percentage as weighed with the driver will be 55.00 %.

 

9.4                ENGINES

9.4.1           Must be same make as the body. GM to GM, FoMoCo to FoMoCo, Mopar to Mopar

9.4.2           Only factory produced OEM parts and components will be approved. Unless otherwise specified.

9.4.3           Pistons, valves and valve springs may be factory type replacement of similar weight and material.

9.4.4           Engine must remain in stock location or no further back in the engine compartment as to allow the center line of the upper ball joints to be forward of the number 1 sparkplug. Aftermarket engine mounts approved.

9.4.5           It is recommended that compression ratio not exceed 10.5 to 1.

9.4.6           HEADS

9.4.6.1      No porting of cylinder heads allowed and will be stock for make.

9.4.6.2      No Bowtie, Cleveland v-4, or W-2 heads. No after-market heads allowed.

9.4.6.3      Machining for screw in studs approved. Machining on head for use with early model intake manifolds approved. Machining for the purposes of truing or surfacing approved.

9.4.6.4      Stock type rocker arm assembly only. After-market stamped steel replacements of similar weight and material approved.

9.4.7           Intake manifold will be stock for make cast iron only, cast iron marine applications approved. No aluminum. No porting.

9.4.8           Exhaust manifolds will be stock for make. Headers not approved. No porting approved.

9.4.9           Camshafts may be hydraulic or solid of any manufacturer. Use of cam button approved. No Roller or Mushroom camshafts approved.

9.4.10       Cam timing will be chain and gear type of any manufacturer.

9.4.11       Ignition will be stock for make camshaft driven distributor only. No magnetos, MSD or after-market performance parts. Modules, points and coils will be factory stock type replacement, no MSD Parts or Coils approved.

9.4.12       Flywheel must be steel and unaltered with factory casting numbers intact. Machining of flywheel permitted for balancing and surfacing only.

9.4.13       Clutch disc and pressure plate will be stock type replacement, no racing clutches approved. 10.4” will be the minimum clutch disc diameter. Hydraulic throw out system approved.

9.4.14       Fuel pumps must be factory type replacement. No electric pumps allowed.

9.4.15       Air cleaner or butterfly cover required. Hood may be clearanced for taller air cleaner.

9.4.16       Racing fuels allowed. AV-GAS approved.

9.4.17       Oil pans may be over-sized. After-market claimer pan approved. Oil coolers and remote filter locations are approved.

9.4.18       Aftermarket steel or aluminum water pumps approved, pulley system optional.

9.4.19       Alternator not required. If an alternator is used it must be stock.

9.4.20       Mechanical or electric fan(s) approved, aftermarket allowed. Must be shrouded minimum three sides. (top and sides)

9.4.21       After-market dampners of factory diameter approved.

9.5        CARBURERATION

9.5.1           Holley 4412 is the class carburetor. No other carbs approved unless otherwise noted.

9.5.2           Removal of choke horn is not permitted.

9.5.3           Carburetor adaptor will not exceed 1” in thickness, material optional.

9.5.4           NON MARINE intake manifolds will be allowed an additional 1” spacer plate between the carburetor and the manifold for a total maximum of 2”

9.5.5   Two throttle return springs required.

9.6                TRANSMISSION

9.6.1           Automatic transmission use is optional.

9.6.2           Transmission must be stock for make.

9.6.3           Torque converters will be stock stall speed.

9.6.4           Transmission coolers and cooler lines shall be contained outside of the driver’s compartment. Is also must be located in front of the front firewall or behind the rear firewall. Any Transmission cooler located other wise will be subject to tech approval for driver safety.

9.6.5           Manual gearboxes will be stock for make with no alterations.

9.6.6           NHRA approved explosion proof bell housing for manuals or a transmission blanket for automatics is recommended.

9.7                REAR END

9.7.1           May be stock for make and model. Swaps from other makes will be allowed; all mounting points must be made to be direct bolt in to receiving car.

9.7.2           Gear ratio optional.

9.7.3           Welding, mini spool or full spool may lock differentials.

9.7.4           No posi-trac, limited slip, Gold trac or Detroit Lockers.

9.7.5           Floater rear ends not approved.

9.7.6           Aftermarket axel allowed on the RR.

9.8                BODY SPECIFICATIONS

9.8.1  1955 though current American made sedans, coupes, or pick-ups. Windshield posts are mandatory. All bodies and body panels shall be maintained or replaced as needed to keep stock appearing look, as approved by Officials or Promoter.

9.8.2           Body and chassis must be of the same make.

9.8.3           Body must be complete for declared make and model.

9.8.4           Wheel base minimum will be 101”. Wheelbase will remain stock for make and model of chassis. No car will be allowed a tolerance from side to side of more than ¼”. 

9.8.5           Bodies to remain stock in appearance. Destroyed panels must be repaired or replaced. Steel replacement panels may be fabricated from minimum 20 gauge sheet metal and must follow original body lines. Must resemble stock look, at tech discretion.

9.8.6           Fenders and quarters panels may be trimmed for tire clearance. Trimming not to exceed 3” from top of tire. Tech discretion

9.8.7           All exterior molding and lights must be removed, including rear and side glass. Head light openings must be covered. Rear glass may be replaced with minimum 1/8” lexan, or louver.

9.8.8           Windshield optional. If removed it must be replaced with a maximum ½” X ½” wire mesh screen covering the entire opening and be securely mounted. Lexan windshields approved. Windshield opening must have one or two “tire bars” securely welded into the opening to prevent a tire or like object from entering the driver’s compartment.

9.8.9           Rear spoilers are approved. If spoiler is other than factory stock for make, it may not exceed 6” in height and 60” in width.

9.8.10       Front inner fenders may be removed. All other inner panels may be trimmed, including hood and rear deck lid.

9.8.11       Inner panels in trunk area may be removed for fuel cell installation.

9.8.12       Hood and rear deck lid will be securely fastened using (4) four hood pins or (2) two hood pins and (2) two hinges. NUTS AND BOLTS ARE NOT APPROVED FOR SECURING HOOD OR DECK LID.

9.8.13       Front firewall will remain stock and in stock location. All openings shall be filled or repaired with a minimum 22 gauge sheet metal.

9.8.14       Stock floor pan will be intact and complete from the front firewall rearward to at least the bottom of the rear seat riser. Any holes must be filled or repaired with minimum 22 gauge sheet metal.

9.8.15       Rear firewall will be intact. Stock material may be replaced with minimum 22 gauge sheet metal. All openings shall be filled or repaired with a minimum 22-gauge sheet metal.

9.8.16       Frame and/or unibody must be complete and unaltered unless other wise noted within these rules. Front cross member notches that are not being used will be approved. i.e, fuel pump clearance.

9.8.17       Repaired rear frame sections will be allowed with tech approval and will be replaced with stock donor frame material.

9.8.18       Replacement of damaged rear stock rails with tube steel, may be weight penalized if tube steel replacement extends forward of the rear end centerline. Tech discretion.

9.8.19       Any weight penalties are at tech discretion.

9.8.20       Exterior nerf bars optional. Nerfing not to extend more than 1 ½” past the body skin at any time, ends must be capped or welded shut. Nerfing allowed on both sides, between front and rear tires only. 1” O.D. round or maximum 1” X 2” square tubing is the only approved material for exterior Nerfing.

9.8.21       BUMPER

9.8.21.1  Front and rear bumpers may be fabricated from tube steel if covered by a factory stock or after-market bumper cover. Any pre 1990 after-market bumper cover may be used on any car. Post 1990 aftermarket bumper covers will be allowed for truck applications.

9.8.21.2  Exposed Factory Stock front and rear bumpers must be strapped to the fender or the quarter panels with a minimum 1/8” thick steel strap. Recommended piece 1 ½” X 12” should be securely bolted or welded in place, unless covered by a plastic bumper cover.

9.8.21.3  Front bumper may be reinforced for radiator protection. Two upright bars and two cross bars not to extend outside the frame horns, rear brace bars to be mounted in front of the A-arms. 1 ¾” pipe or square tubing maximum. Not to extend beyond the front bumper. May be integrated into the front hoop.

9.9                SUSPENSION

9.9.1           Suspension must be stock with the following exceptions.

9.9.2           Front and rear shocks must be stock steel or stock type steel replacement. Race shocks approved. All Shocks must mount in stock location, on stock mounts.

9.9.3           Front strut cars will use stock type replacement struts and will mount in stock location. Towers must remain in stock location and may be notched for camber/caster adjustment.

9.9.4           Front coil springs may be stock type replacement. Minimum height is 12” freestanding and out of car. No adjustable or non adjustable spacers on top of spring allowed. No weight jacking bolts of any kind allowed. Trimming or heating to a minimum height of 12” freestanding and out of car, approved.

9.9.5           Torsion bars will be stock for make or stock type replacement only.

9.9.6           Front Strut cars, Struts may be stock type replacement. Minimum spring height is 11.25” freestanding and out of car. No adjustable or non adjustable spacers on top of spring allowed. No weight jacking bolts of any kind allowed. Trimming or heating of a spring to a minimum height of 11.25” freestanding and out of car, approved.

9.9.7           Leaf spring cars will remain leaf spring cars. Stacks may be altered. Any spacers or lowering blocks used in the leaf stack must be securely mounted. Front mounts will be stock. Rear shackles will be stock or fabricated to match stock measurements center to center with no more than ½” in tolerance. No threaded or adjustable jacking devices approved.

9.9.8           No chains or stoppers may be used to stop suspension movement.

9.9.9           Use of twisties, or spring rubbers are approved in front or rear coil springs.

9.9.10       Rear coils springs of any type approved. Shims or spacers may be used to raise or lower either corner of the car.  No threaded or adjustable jacking devices approved. Spring pockets may be altered or replaced, but will remain in stock location.

9.9.11       Sway bars will remain stock for make and must be mounted in stock location. Connection method to lower control arms is optional. Sway bars may be adjustable. Poly bushings approved.

9.9.12       No heating, cutting, welding, grinding, or bending of any suspension component allowed, unless otherwise noted within these rules.

9.9.13       A-arms, control arms, and suspension components must be stock for make and model. Mounting locations will be stock for make and unaltered. Ball joints will be stock for make or stock type replacement. Center trimming of front a-arms is approved for shock bolt access.

9.9.14       Rotors/Hubs and spindles will be stock for make. Relocation of lug pattern approved.

9.9.15       Poly or steel bushings approved for front or rear suspension components.

9.9.16       STEERING COMPONENTS

9.9.16.1  Power steering pumps, if used, will be stock.

9.9.16.2  Steering shaft may be fabricated, if spherical rod ends bearings are used in the steering shaft they must be minimum 5/8”. All other steering components must be stock.

9.9.16.3  Removable steering wheel is permitted if industry standard hex or splined, quick release hub is used as per installation.

9.10            ROLL CAGE

9.10.1       Minimum 4 point roll cage is mandatory. The roll cage must be mounted to the frame. Not to exceed 7 points, not including front hoop connection points.

9.10.2       Main bars must be a minimum 1 ½” black pipe, 2” O.D. maximum, with a minimum 1/8” wall thickness, welded or securely bolted to the frame. Braced not less than half the height of the main bar back to the frame. At least one diagonal brace in the main bar. Minimum three sissy bars on the driver’s side and two on the right (passenger) side. A minimum 1 ¾” O.D. roll bar tubing or manufactured roll cage kits are recommended. No exhaust tubing or galvanized pipe allowed.

9.10.3       Gussets are required on all 90-degree joints.

9.10.4       UNIBODY-Roll cage must be securely fastened to the floorboards by welding 1/8” thick minimum plate, 4” x 8” or 6” x 6” on top and/or underneath the floorboards. Using 3/8” bolts per mounting, or cage may be directly integrated into the sub frame at all main points with full circumference welds. Front and rear sub-frames may be tied together with custom or aftermarket sub-frame connectors.

9.10.5       Front hoops allowed to penetrate the firewall. Hoop bracing behind the upper A-arms is permitted. Radiator support may be integrated in the hoop.

9.11            BRAKES

9.11.1       All four corners must be stock and in working order. Stock swaps for larger or disc brakes allowed in front.

9.11.2       Rear disc brakes of any make stock application approved. No aftermarket parts approve with the exception of mounting brackets.

9.11.3       Master Cylinders will be stock.

9.11.4       Proportioning valves not approved.

9.12     BATTERY. The battery must be securely mounted. between the frame rails and in front of the rear-end. If the battery is mounted in the drivers compartment, then it must be mounted securely in a marine type battery box. Tech approval required.

9.13      DRIVESHAFT

9.13.1    Drive shaft must be painted white.

9.13.2   Aluminum or composite not allowed.

9.13.3   See also rule 3.2.10 Minimum specifications.

9.14 EXHAUST SYSTEM

9.15            See rule 3.2.4 Minimum specifications.

9.16            Exhaust must exit behind the driver and will be contained underneath floor pan of the vehicle. Exhaust may not be run through the drivers compartment.

9.17            FUEL SUPPLY

9.17.1       Commercially produced fuel cell is mandatory. Minimum height as measured from the ground is 8 inches. Location ahead of the rear bumper will be no less than 18 inches

9.17.2       Rubber fuel line passing through the driver’s compartment will be contained in conduit or pipe from front firewall to rear firewall.

9.17.3       See Minimum Specifications. SECTION 3

9.17.4       Racing fuels allowed. AV-GAS approved. No methanol or nitro.

9.18            MIRRORS. One stock automotive type mirror approved for windshield rear view. One stock automotive type mirror approved for left side, not to exceed 3x3 inches.

9.19            RADIATOR

9.19.1       Only one radiator allowed.

9.19.2       Must mount in stock location. Mounts optional.

9.19.3       One-gallon overflow tank required.

9.19.4       After-marker radiator allowed.

9.20            WHEELS

9.20.1       Steel wheel not to exceed 8” in width.

9.20.2       Minimum white spoke type wheel mandatory on the right front corner, not to exceed 8” in width.  Racing wheels approved.

9.20.3       Minimum ½” wheel studs mandatory on the right front wheel.

9.21            TIRES. Class tire to be used, as determined by MS and approved tire distributor.

9.22            HOOSIER 970 tires are the approved tires for competition.

9.22.1       Chemical softening of tires is prohibited.

9.23            ELECTRICAL. See Minimum Specification Section 3.

9.24            SEAT

9.24.1       Aluminum, high back racing seat required. Steel framework around the seat is recommended. Installation is subject to tech approval. Right side head support is recommended.

9.25            FIRE EXTINGUISHER

9.25.1       Participants car must be equipped with a 2 ½ lb fire extinguisher within easy reach of the driver, must be full at all times and have a readable gauge.

9.25.2       Each participant must keep a second fire extinguisher in his/her pit area. The extinguisher will be a minimum 2 ½ lb or larger.

9.26            SAFETY ITEMS- Go to Section 3

9.26.1       SEE SPEEDWAY MINIMUM SPECIFICATIONS FOR ALL SAFETY ITEMS THAT ARE APPLICABLE TO YOUR CLASS

9.26.2       Left side window net must be fitted with a seatbelt connector for quick release.

9.27            PROTESTS

9.27.1       See Speedway Engine Protest procedures. Section 5

9.27.2       See Speedway Chassis Protest procedures. Section 5

9.28            REGISTRATION AND LICENSING (car #’s) See rule # 2.2

9.29            ONE-WAY RADIOS

1)        One-way radios (scanners/ race scan) are required, must be on race control channel at all times. 

2)        No two-way radios permitted.