Last Modified - 2008
Required Safety Items For all Classes
Five point safety belts, sub belt, shoulder harness quick release type required. Belts must be mounted to roll cage, frame, or reinforced floor. Belts are recommended to be no more than 2 years old.
Helmet must be Snell SA90, SA95, or SA2000 with eye protection.
Fire suit, neck brace, and racing gloves required.
Fire extinguisher - mounted within driverís reach.
Master kill switch shall be clearly marked.
No two way radios or communications of any kind.
Drive shaft loop.
4-Cylinder Engine Claim
$500.00 claim on complete car less safety equipment, battery, battery cables, fuel cell, fuel pump and fuel lines.
Top four finishers in every race must report to inspection area and are subject to claim in the A feature by any driver finishing fifth of farther back. Any driver lapped by fourth place car is not eligible to claim. Driver allowed only one claim per event. In case of multiple claims on same engine, engine will go to qualified claiming driver by draw. Driver making claim must drive his car immediately after finish of feature to the claiming area under its own power. Driver is only eligible for motor claim if finished the race without being disqualified.
4-Cylinder Car Claim is also subject to rules clarified in the general engine claim section above.
Modified should closely follow IMCA type modified rules with the following exceptions:
-Track tire is the Hoosier IMCA or American Racer G60-15.
-No weight rule.
-Bert/Brinn type transmissions allowed.
1. ROLL CAGES Must consist of continuous hoops not less than 1.666-inch outside diameter with a wall thickness of at least .095-inch. Low carbon, mild steel tubing is recommended. Must be frame-mounted in at least six places. No brazing or soldering allowed. Must consist of a configuration of front and rear hoops connected by tubing on the sides or side hoops. Driverís head must not protrude outside cage with helmet on and strapped in driverís seat. Must have minimum of one cross bar in top halo of roll cage. Roll cage must be securely supported and braced. Protection of feet is mandatory. Bar across back of engine with vertical bars and rub rails, or similar protection. No brace bars forward of cage may be higher than stock hood height. Main cage no further forward than engine plate.
2. DOOR BARS A minimum of three driver side door bars, at least 1.5-inch O.D., must be as parallel with the ground as possible, and located perpendicular to the driver so as to provide maximum protection for driver, but without causing undue difficulty in getting into or out of vehicle. The sidebars must be welded to the front and rear of the roll cage members. Must have at least one cross door bar, minimum 1.25-inch O.D., on passenger side of car, either horizontal or angled. Steel door plates, 18 gauge or .049-inch minimum thickness steel, must be securely welded to outside of door bars on driverís side. Plate must cover the area from the top door bar to the bottom door bar and from the rear down post to five inches in front of the seat. Must be visible for inspection.
3. ELECTRONICS No transmitting or listening devices. No electronic monitoring computer devices capable of storing or transmitting information except tachometers. No digital gauges, timing retard controls or oxygen sensors allowed. One 12-volt non-adjustable ignition box and coil allowed - must be out of driverís reach. No additional ignition accessories allowed. The only change that can be made with ignition box is rev-limiter setting, and only one high-end setting is allowed. This setting can be changed through one chip, or an internal setting inside the box. No electronic traction control devices allowed, penalty is a one-year suspension and a $10,000 fine.
4. EXHAUST Exhaust system must be mounted in such a way as to direct spent gasses away from cockpit of vehicle and away from areas of possible fuel spillage.
5. FUEL SYSTEM Racing fuel cells required and must be mounted by at least two solid steel straps, two inches wide around cell. Fuel cells must be enclosed in steel container and must be mounted securely behind rear axle and between the rear tires, no lower than six inches off the ground, protected by roll-cage tubing. Protective tubing must cover the rear and extend past both sides of fuel cell. Fuel cell must be a minimum of four inches ahead of rear bumper and no part of fuel cell shall be lower than protective tubing. Fuel cell vents, including cap vent, must have check valves, and bladders are highly recommended. Fuel cells are limited to 32-gallon maximum capacity. Pick-up must not be underneath fuel cell. A limit of one standard fuel filter allowed between the fuel cell and carburetor.
6. FUEL May be either gasoline or alcohol. NO Nitrous Oxide. One 2- or one 4-barrel carburetor allowed; must be naturally aspirated. NO fuel injection. NO electric fuel pumps.
7. BATTERIES One 12-volt battery only, must be securely mounted and shielded. All vehicles must have the capability of starting without being pushed or pulled. Track officials may allow cars that are temporarily unable to start without being pushed to start a race in their earned position. This decision however would be for one week only. That car will be required to be fixed by the following week.
8. WEIGHT Any weights added to other areas of vehicles must be securely mounted with at least two half-inch bolts, painted white and have the car number on it. No titanium, magnesium or carbon fiber products, parts or components allowed. No gun-drilled, tubular or hollow bolts or studs.
9. TIES AND WHEELS IMCA G60-15 tires mandatory. You may sipe or groove tires. All wheels must have an ĎI.M.C.A. approvedí wheel prior to use as a bead lock wheel. External, steel bead lock only and it cannot make the wheel any narrower than 8 inches and no wider than 8.75 inches. Must use only steel bolts. One foam type or plastic mud cap allowed on right rear only. Rim-mounted bleeder valves are allowed.
10. FRAMES No part of racecar can be lower than four inches from the ground (exception is front cross member and oil pan). Factory production complete full 1960 or newer parallel American passenger car frames only. Frames may be cut in rear only at point not further than 36 inches from center or rear end housing. No front clips or tube type allowed. Maximum two inch wide by four-inch tall frame stiffener may be welded directly to outside of frame rail. Frames may not be widened or narrowed and must be able to support roll cage on both sides. Must be full and complete both sides. Front cross member must remain full and intact, center of cross member may be notched and boxed for radiator and/or steering clearance only. No Jeep, Bronco, (etc.) or four-wheel drive frames allowed. No sports car frames allowed. No front wheel drive allowed. Minimum wheelbase, 108 inches, both sides. Maximum overall width (front or rear) shall not exceed 78 inches from outside of tire to outside of tire.
11. SUSPENSION AND STEERING Front suspension and steering must be unaltered approved OEM and be in stock location, and must be replaceable by stock parts. Outer tie rod end and adjustment sleeve may be replaced by a minimum .625-inch rod end and steel tube. Weight jack must be in original centerline of spring. Stock passenger car spindles only; no fabricated spindles. Spindles can be ground for brake caliper clearance only. Bottom A-frames cannot be altered or moved (exception: can weld shock mount on A-frame). No offset or bearing type lower control arm bushings. Tube-type upper A-frames allowed and can be moved. Front sway bar must be approved OEM. Suspension, steering, and rear end parts must be steel. Steering box must be steel approved OEM and must remain within original bolt pattern for type of frame used. No rack & pinion allowed. Steel steering shafts and knuckles only. In-cockpit steering may be modified to suit driverís taste, but must be kept on left side of cockpit. No center steering allowed. No coil over shocks allowed either front or rear. No homemade coil overs used anywhere on racecar. Rear of frame may be altered to accept leaf or coil springs; any coil spring must be at least 4.5 inches outside diameter. One steel coil spring per wheel only. No torsion bars allowed in rear. Progressive springs allowed only on pull or left bar. No devices allowed that would enable driver adjustment to alter wheelbase or for weight jacking while car is in competition. No adjustable shocks. No covers on suspension parts except clear cover on slider and a shield to protect the shocks. This shield can cover no more than the front half of the shocks. No Schrader valves allowed.
12. BRAKES Must have a working caliper and rotor on each wheel and must lock up all four wheels. No brake shut-off or pressure sensitive devices allowed. One proportioning device allowed, front to rear only. Brake lines must be outside frame rails and visible. Vented rotors only, no scalloped rotors. Rotors cannot be lightened. Rotors may be re-drilled for different bolt pattern or larger studs. Must be steel, approved OEM calipers.
13. BODIES 1970 or newer American compact passenger car only, no panel vans or station wagons. Stock appearing front windshield and rear window support unit, painted roll bars not acceptable substitute. May utilize a flat half-windshield, with no wings, mounted to the roll cage. Mirrors not allowed. Must have a minimum of three windshield bars in front of driver. Cowl panel in front of driver can be no wider than cockpit and no farther back than the steering wheel. Firewall is mandatory. Minimum .125-inch aluminum, or 16 gauge or .060-inch steel, complete floor required. All body parts should be recognizable as factory production vehicle. Fiberglass or metal duplicates of body parts ore permitted. Handmade body parts may be constructed of steel, aluminum, or fiberglass, but should be recognizable as factory production vehicle. All cars in competition must have a complete paint job, no reflective doors or quarter panels. No plastic body parts allowed. Body must be the same width, front to rear, and parallel to the frame. Original roof line of vehicle must be maintained. Must be fiberglass full size roof. No wings, spoilers or any other ground effects are allowed anywhere outside or inside car. Sail panels must closely resemble examples shown on body diagram and be the same on both sides of car. Reinforcing lips on rear of sail panels must be 180 degree bends. Cars must be numbered with large legible numbers on both sides, on top and rear panel. Numbers on sides and top of car must be in contrasting color from body, be at least four inches thick and at least 20 inches high. Recommended that no holographic or reflective numbers be used. Sponsorsí names must not interfere with car numbers and must be neatly lettered. Engine compartment will remain open, no side panels; hood sides may have maximum four-inch drop and must be enclosed at rear of hood; maximum hood scoop height - six inches. Passenger side of body must be no further forward than rear of block. Rear of bodies to be solid panel at least eight inches high and include car number. No panel in front of right door to engine compartment. No inner panels. No car covers. Driver and passenger side windows must have at least 12-inch opening, measured at center of window, between the lowest point at the top of window, whether the roof or roll cage, and the highest point at the bottom of window, whether the interior or body.
14. BUMPERS Center of bumper, front and rear, must be 18 inches, plus or minus two inches, from ground.
(A) Steel bumpers must be used both front and rear at all times and securely mounted with minimum .375-inch bolts. Must be made of minimum 1.25-inch OD tubing, .065 wall thickness on front - .095 wall thickness on rear, and must be able to support car if lifted by wrecker. Two-bar front bumpers must be mounted frame end-to-frame end, no wider than the width of material outside frame horns, with the bottom loop parallel to the ground. Top bar must be directly above bottom bar, minimum 6.5 inches apart, measured center to center at front of bumper (see P in body diagram), so bumper is perpendicular to ground.
(B) Rear bumper, steel nerf bars and bodies must not extend beyond width of tires, and must not contain any sharp edges. Rear bumper no more than two inches wider than body on each side.
(C) Rear bumper must resemble one of three configurations, see diagram on page four.
15. REAR END Any approved OEM passenger car type or truck rear end may be used.
(A) No aluminum allowed, except lowering blocks, axle cap, and drive flange. A one-inch inspection hole in center section is recommended. Full steel spool, steel mini spool or welded rear ends only. Steel axles only.
(B) Quick change rear ends are allowed. No cambered rear ends, one piece drive flange only. No electronic or mechanical traction control devices allowed.
16. ENGINES No aluminum heads, blocks or oil pans. No Magnetos.
(A) Any American make engine may be used as long as rear of engine (bell housing flange) is mounted at least 72 inches forward from the center line of rear axle. Engine offset must be kept within two inches of centerline of front cross member with engine level. 11 inch engine height minimum from ground to front center of crankshaft.
(B) All engines used in competition must be able to be used in conventional passenger car without alterations. Motor mounts cannot be removed or altered. Castings and fittings must not be changed. No machine work on outside engine.
(C) ďWetĒ oiling system only. External oil pumps will go with engine if claimed. Oil coolers must not protrude above interior. Accumulators cannot be mounted between driver and left-side door.
(D) Cooling system may be modified. Any overflow tubes must be directed to the ground, between frame rails. Radiators to be mounted in front of engine only.
(E) Conventional air cleaner housings only. No top flow air cleaner housings allowed.
All A-Modified rules will apply except for the following:
1. 2 barrel gas carburetor only
2. $350 plus exchange: Carburetor Claim
3. $625 plus exchange: Motor Claim
4. all cars will run on pump or racing gas only
5. must run manual fuel pump
6. Bert/Brinn and Falcon type transmissions ARE allowed
7. IMCA tires allowed
8. you may still groove and condition tires
9. 8-in. spoiler allowed
10. aluminum tops allowed
Stock Car Class
1. FRAME - Any American OEM Rear Wheel Drive
Passenger 1964 or newer. May also use Camaro or Mustang, 1970 to 1982, minimum
105Ē wheel base. Frame and body must match manufacturer.
2. ROLL CAGE - Should be .095 inches thick, tubing should be 1.75Ē O.D. Four point with down bars must be mounted in at least six places. Roll bar padding required in driverís compartment. Driverís head must not protrude out of roll cage with helmet on, while strapped in the driverís seat. Must have minimum of one cross bar in halo of roll cage, no brazing or soldering allowed. No brace bars forward of cage may be higher than stock hood height; main cage must be no farther forward than the engine plate. Minimum of three driver side door bars and two bars on the passenger side although we recommend four door bars on driver side and three on passenger side. Must have doorplates. Doorplates must be 18-gauge or .049 inches steel minimum. Numbers are mandatory on both side of car and on roof. Numbers must be readable by scorekeepers in the scorerís booth. No homemade seats. Seats must be mounted in framework of roll cage. SEAT MUST NOT BE MOUNTED ON FLOOR PAN.
3. BODY - Must be stock appearing. Aftermarket panels accepted, but must remain stock appearing. Aftermarket nose and tailpieces allowed.
4. DRIVER COMPARTMENT - Must use aluminum high-back racing seat bolted in with a minimum of 3/8 bolts. Driver compartment must be sealed off from fuel cell, engine, and drive-line. No holes in floor pan, any holes must be covered from bottom with steel. Upper portion of firewall may be replaced using .049 steel. No mirrors.
5. FRONT SUSPENSION - Components must be steel, unaltered OEM, in OEM location and match frame. Must use stock lower A-frame bushings only, no offset or bearing type. No sway bars. Weight jacks allowed, must be in original centerline of spring tower. Aftermarket upper A-frame permitted on 1978-1987 GM mid-size frames. Single hole shock mounts only. Shock location may be moved and may go through center of aftermarket upper A-frame, but frame cannot be altered in any way.
6. STEERING - Components must be steel, unaltered OEM, in OEM location and match frame. Stock steering column may be replaced with steel steering shafts (collapsible recommended), steel knuckles only, steering quickener, steering wheel and quick release may be aluminum.
7. SHOCKS - No coil over air or remote reservoir shocks permitted. One steel nonadjustable shock per wheel. No Schrader or gas refill ports.
8. SPRINGS - May use a minimum of 4.5 O.D. spring per wheel.
9. REAR SUSPENSION - Components must be steel, unaltered OEM, in stock location, and match frame. Rubber or nylon control arm bushings only, no offset or bearing type. Welded single-hole shock mounts only. Coil springs may be moved, but center line of axle tube can be no further forward than the front of spring, or no further back than rear of spring. No independent rear suspension. Shocks may be moved, but must remain behind housing.
10. REAR END - Any steel OEM passenger car non-cambered rear end (housing and carrier) allowed. Floaters allowed. No sway/pan hard bars. All components must be steel. Full steel spool, steel mini spool or welded rear end only. Steel axles only. No quick change devices.
11. BUMPERS - Front and rear tow hooks mandatory. All front bumpers must be mounted minimum six inches from front frame horns. Steel bumper mounts only. No sharp edges, no cow catchers. Fabricated tubular bumpers allowed, but must be covered by plastic nose or tail piece and bent to fit with rounded ends. Main bumper bar must be minimum 1.5 inch O.D. (maximum 2.0 inch) by .083 inch wall thickness on front, and 1.75 inch O.D. by .120 inch wall thickness on rear.
12. TIRES & WHEELS - May use American Racer G-6015 or Hoosier G-6015 IMCA stamped tires only. No softening or conditioning. No recaps.
Steel wheels only. No aluminum. Right side beadlocks approved.
13. BRAKES - Must have 4 wheel brakes. OEM or OEM replacement allowed, drum or disc. No lightening of components. One proportioning device allowed.
14. FUEL SYSTEM - Mechanical push rod pumps only. No electric pumps. GASOLINE ONLY. Maximum 22 gallon. Must be in approved steel container and securely fastened in trunk above frame rails.
15 CARBURETOR - Any 500 C.F.M. 2 barrel not to exceed 1 11/16Ē venture 1 inch spacer allowed.
16. EXHAUST - May use round tube headers. No crossover or Y pipes.
17. ENGINE - Must be steel block and heads. May use aftermarket heads. Dart, World Products, etc. No roller cams, flat tappet cams allowed. May use roller rockers and stud girdle. May use cast or aluminum intake. Approved part numbers for aluminum intake are Weiand #7547-1, 7515, 8023, and 7516. Vortec intake allowed also if using GM Vortec heads. Aftermarket ignition allowed, no traction control. No magnetoís.
18. TRANSMISSION - Must use stock OEM case, no Bert, Brinn, or Falcon. Must have 2 forward gears and 1 reverse gear. May use mini clutch, but must have approved steel explosion- proof bell housing.
Automatic: Must remain in stock or stock replacement case, with a functioning OEM appearing pump. Aluminum OEM bell housing may be replaced with aftermarket explosion-proof aluminum bell housing. Original OEM bell housing must have approved scatter shield constructed of minimum .125 inch by three inch steel, 270 degrees around flex plate.
19. WEIGHT - Minimum weight 3,100 lb. after race.
4-Cylinder Stock Class
A. Any American made, front wheel drive automobile.
B. No convertibles, station wagons, Jeeps, SUVís, pickups, etc.
A. Four (4) cylinder engines only.
B. Completely stock. NO performance parts of any kind allowed.
C. Normally Aspirated- no turbos.
D. Rotary engines not permitted.
E. Maximum of (3) valves per cylinder.
F. (16-valve engines not allowed)
A. Stock carburetor.
B. Fuel injection permitted if car came originally equipped as fuel injection. If equipped with electric fuel pump, make sure pump is wired thru oil pressure switch. If vehicle is not equipped with a switch, it must be added.
C. Two throttle return springs mandatory mounted to engine.
A. Spider gears may be welded together to lock front end together.
A. Stock OEM parts only.
A. Stock steering for the make and model.
Wheels, Tires, Brakes
A. Wheels: Stock
B. Right front oversize lug nuts recommended.
C. Wheel spacers are not permitted
D. Any DOT street legal tire permitted. 8 1/2Ē sidewall to sidewall max.
E. Stock brake system for make and model. All brakes must function. No brake adjusters.
A. Four point cage (min.) required. 1 Ĺ diameter. 095 wall with gussets as needed welded to (4) 4x4 plates and bolted or welded to floor. No bars may pass through firewall forward or rear. Two (2) door bars inside drivers door.
B. Galvanized aluminum or exhaust type tubing is not permitted.
C. Recommended 1 Ĺ diameter .095 wall behind driverís seat below shoulder height.
D. Approved padding must be used at any point where driver contact might occur.
Must be inside of trunk with screw or lock type caps. Must be set in steel box with safety straps and secured tightly. Fuel cell recommended.
Seats and Safety Equipment
Racing seat required and racing belts with 5 point harness. No passenger car type seats allowed. All seat belts must be a five (5) point hookup. Must be made of nylon webbing and should be replaced each year. Buckles must be of quick release. . Where belt fastens to frame or cross section, it must be anchored below shoulder height. Recommended 3Ē belts. Passenger belts will NOT BE ALLOWED. Driverís fire suit is mandatory. Full face helmets with a face shield are mandatory. Helmets must be SNELL SA95 or M95 or newer certification. Helmets must have the rating tag/label intact. Window net is mandatory.
No Mirrors, All Glass Must Be Removed, Doors Must Be Bolted or Welded Shut
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