A Modified Rules
DRIVER AGE REQUIREMENT
Driver registration is open to persons 14* years of age or older. Age requirements are subject to change. All drivers who are less than 18 years of age must have all required releases and waivers on file at L A Raceway. (New releases and waivers must be filed each year.) * Drivers under the age of 16 must have two years of prior racing experience.
BODY
1970 or newer American compact passenger car only (no panel vans or station wagons). An aluminum half-windshield may be used on driver’s side of the front window opening only. Stock appearing front window support of now more than six (6) inches at bottom, going straight up to top for non-clear materials. Support may be up to ten (10) inches at bottom, going straight up to top, only if it is a clear Lexan material. A minimum window opening of twelve (12) inches must be maintained on both side window openings. No streamlining at top of windshield. Bodies must have standard appearing windshield opening and corner post must follow standard configuration. Original rood line of vehicle must be maintained with a maximum of five (5) inches of slope from rear to front. No more than one-half (1/2) inch stiffener allowed at the rear of the roof and must turn down perpendicular to the ground.
Sail panels must be of matching design with matching styles on both sides of racecar.
No belly pans. A belly pan will be defined as any object or material that alters the airflow under the racecar.
No panel in front of the right door next to the engine compartment.
No racecar will be allowed to compete with excessive (to be determined by an official) body damage.
Spoilers: A maximum rear spoiler height of eight (8) inches of total material will be allowed for racecars.
Rear spoiler may not exceed the width of the rear deck lid. A maximum of four (4) supports may be installed on the front of the rear spoiler. Supports may extend to a maximum of two (2) inches above and a maximum of two (2) inches behind the top of the rear spoiler. Supports may be a maximum of twenty-four (24) inches in total length. Fins, wings, or other air spoilers (except as noted above) are not allowed.
The rear deck lid and/or trunk area must be covered. Rear of bodies “may” utilize a solid rear panel at least eight (8) inches high which extends from the left quarter panel to the right quarter panel. If so, the rear panel must be securely fastened and must display the racecar number on either the left or right side. No gaps or holes of any kind are allowed in the rear panel. A racecar with a rear panel that is loose or becomes separated from the racecar during an event will be subject to disqualification.
Aluminum roofs are allowed
Doors and quarter panels may be mounted a maximum of one (1) inch above the deck.
Excluding hood and nosepiece, the top of the body should extend no further forward than the back of the engine block. The bottom of the body may extend twelve (12) inches forward of the back of the engine block.
Bumpers: Both front and rear bumpers must be used, and must not have any sharp edges. Any inappropriate bumper will be disallowed by an official. Front bumpers should be mounted from frame-end to frame-end with the bottom loop parallel to ground. Bumpers must be made of a minimum of one and one-quarter (1 1⁄4) inch tubing and must be able to support the racecar if lifted by a tow vehicle. Rear bumpers may be constructed of tubing or flat stock, and must protect the fuel cell. Center of bumpers (front & rear) must be at least sixteen (16) inches from the ground and no more than twenty (20) inches from the ground. Rear bumpers may be no more than two (2) inches wider than the body on each side and may not be open-ended (must wrap around and be connected to side rail bars).
Appearance: All racecars must be numbered with large legible numbers on both sides, on top and on the nose and real panels. Numbers on the sides of the racecar should be contrasting color from the body and be at least four (4) inches thick and at least eighteen (18) inches high. Top numbers should be at least four (4) inches thick and twenty-four (24) inches high.
Officials reserve the right to assign, approve or disapprove any advertising, sponsorship or similar agreement in connection with any event. All cars must be neat appearing and are subject to approval of officials to compete. By competing in an event, all drivers agree to comply with the decisions of officials in this regard.
A Modified Body
ROLL CAGES
Round steel tubing, seamless roll-over bars are required for the basic roll cage, and must be acceptable to officials. Acceptable tubing is as follows: one and three-quarters (1-3/4) inches by nine-tenths (.090) of an inch or one and on-half (1-1/2) inches by ninety-five one-hundredths (.095) of an inch for mild steel and DOM tubing (one and three-quarters (1-3/4) inches by eighty-three one-hundredths (.083) of an inch for chrome-molly tubing). Aluminum and/or other soft metals are not allowed. Roll bar connections must be properly welded.
Roll bars within the driver’s reach must be padded with an accepted material as determined by an official. Fire retardant material is highly recommended
.
Installation and workmanship must be acceptable to officials.
Must be frame-mounted in at least six (6) places.
Must consist of a configuration of front and rear hoops connected by tubing on the sides or side hoops.
With helmet on and driver securely strapped into the racing seat, the top of the roll cage must be a min. of 2 inches higher than the top of the driver’s helmet.
Must have a protective screen or bars in front window opening in front of driver’s face.
Protection of driver’s feet utilizing a bar across the back of the engine with vertical bars and rub rails or similar protection is mandatory. Brace bars forward of roll cage may not be higher than the stock hood height.
A minimum of three (3) driver side door bars must be parallel to ground and located perpendicular to the driver so as to provide maximum protection for the driver, but without causing undue difficulty in getting in or out of the racecar. Side bars must be welded to the front and the rear of the roll cage members. Door bars with a thickness of less than nine-tenths (.090) of an inch should have four (4) bars at least one and one-half (1-1/2) inches in diameter at a minimum of eighty-three one-hundredths (.083) of an inch thickness and be gusseted in place. The door bars must have six (6) vertical studs per side of one and three-quarters (1-3/4) inches by eighty-three one-hundredths (.083) of an inch minimum seamless round tubing equally spaced.
FRAME
Factory production complete full 1960 or newer parallel American passenger car frames only. Frames may be cut in rear only at a point not further than thirty-six (36) inches from center of rear end housing.
May only be altered for the installation of springs and shocks
All components must be made of steel and be properly welded.
Must be full and complete on both sides, may not be widened or narrowed and must be able to support roll cage on both sides.
Minimum height from ground is four (4) inches. Exception: Front cross member may be notched for radiator clearance only.
No Jeep, Bronco or similar four-wheel drive frames allowed. No sports car frames allowed. No front-wheel-drives allowed.
Rear of frame may be altered to accept leaf or coil springs.
No hydraulic, ratchet or electric weight jacks anywhere on the racecar. Aluminum jack bolts are not allowed.
Minimum wheelbase of one-hundred eight (108) inches in both sides (no tolerance).
Tubular front clips are not allowed.
Maximum overall width of car (at front or rear) shall not exceed seventy-eight (78) inches from outside of tread to outside of tread (no tolerance).
COCKPIT
Loose objects and/or weights are not allowed.
Air bags are not allowed.
Rear view mirrors are not allowed.
Floor and firewall must be complete in the driver’s compartment. No interior sheet metal can be higher than or enclose a standard window opening. Sheet metal in the driver’s compartment must be horizontal from the top of the driver shaft tunnel to the right side door bars or angle from the top of the drive shaft tunnel upwards to the top of the right side door bars. Driver must be able to exit the racecar from both sides.
Steering: Must be O.E.M. and must remain within original bolt pattern for type of frame used
Rack and pinion is not allowed. May be modified to suit driver, but must remain on left side of cockpit (no center steering). Quick-release metal coupling on steering wheel is mandatory. Plastic couplings are not allowed.
Seat: Factory-manufactured racing seats are mandatory, and must be acceptable to officials.
Homemade aluminum, plastic or fiberglass seats are not allowed. Must be properly installed and seat back cannot be moved back further than rear edge of quarter post. High-back aluminum seats only.
SUSPENSION
Must remain stock-type for the type of frame being used. Steel aftermarket parts may be used as stock components as long as they mount in the stock location and are the same size as the O.E.M. parts. This includes lower tubular A-frames. If using lower tubular A-frames, must match factory specs.
No aluminum or titanium components allowed. Magnet must stick to all components.
Steel tube-type upper A-frames allowed and can be moved.
Aluminum cross shafts and wedge tubes are allowed.
Stock passenger car spindles only – no fabricated spindles. Bottom A-frames cannot be altered, lightened or moved.
Front sway bars may be used. Front sway bars must be made of steel and may be attached to the bottom A-frame using steel heim joints. Sway bars must be solid full-length O.E.M.
Rear panhard bars may be used. Rear panhard bars must be made of steel and may be attached by using a minimum three-quarter (3/4) inch i.d. steel heim joint.
Steel coil-over eliminators or steel/aluminum coil-over kits are allowed, but must conform to shock and spring rules.
Suspension or rear end parts must be steel. Aluminum mounting brackets are permitted.
Shocks & Springs: One shock per wheel only. Air shocks are not allowed. All coil springs must be at least four and one-half (4-1/2) inches outside diameter. Steel springs only. No torsion bars allowed in rear. Canister shocks, Schrader valve shocks, and aluminum shocks are not allowed.
ELECTRICAL SYSTEM
Battery: Must be securely mounted. One (1) 12-volt battery only. 9.2 Ignition:
No magnetos or crank-triggered ignitions. No more than one (1) coil may be used.
Kill switch required within easy reach of the driver. The switch must be clearly marked “off” and “on”.
No electronic traction control allowed
FUEL, FUEL SUPPLY, FUEL STORAGE
Must be automotive gasoline or alcohol only. No additives of any kind. Racing fuel is allowed. May not be blended with ethers or other oxygenates, and may not be blended with aniline or its derivatives, nitro compounds or other nitro containing compounds.
Electric fuel pumps are not allowed.
Carburetor: One (1) two-barrel, four-barrel or Predator carburetor properly installed will be permitted. Must be naturally aspirated. No fuel injection
Fuel cell: Must be commercially manufactured and must be mounted utilizing at least two (2) steel straps. Straps must be two (2) inches wide at all measuring points. Must be enclosed in a steel container and must be protected in rear of axle by roll cage tubing mounted securely. No part may be lower than protective tubing. Protective tubing must be no wider than six (6) inches on both sides. Must have check valves. Limited to a maximum capacity of thirty-two (32) gallons. Must have check valves. A ball-type, flapper or spring, or filler rollover valve is mandatory for fuel cells without a positive seal filler neck/cap system.
TIRES & WHEELS
Wheels: Must be fifteen (15) inches in diameter and eight (8) inches in width. Stickers are not required.
Must be reinforced steel only. Wheel covers are allowed on the right side wheels only. Wide, five wheel adaptors are not allowed. Steel or aluminum spacer between hub and wheel is allowed, but overall width of racecar cannot exceed the seventy-eight (78) inch limit. Aluminum or steel lug nuts are allowed.
Tires: American Racer G60 (KK704) or IMCA stamped Hoosier G60. Softening is not allowed. Grooving and siping allowed. Right side bead locks allowed.
BRAKING SYSTEM
Must be operating on all four wheels and must lock up all four wheels during inspection.
Must have caliper and rotor on all four wheels. Vented rotors are required on front wheels.
Electronic brake actuators are not allowed.
Calipers may not be lightened and must be O.E.M.
Steel or aluminum single-piston O.E.M.-type calipers are allowed.
Rotors must be steel and may not be lightened or drilled. Rotors may be re-drilled for different bolt patterns or larger studs.
Front-to-rear brake bias is allowed.
Brake shut-offs are not allowed.
Brake lines must be visible.
DRIVE SHAFT
A loop is required and must be constructed of at least one-quarter (1/4) inch by two (2) inch solid steel. Loop must be mounted no more than six (6) inches from the front of the drive shaft tube. Alternatively, two (2) loops of one-quarter (1/4) inch by one (1) inch solid steel fastened to cross member are allowed.
Must be painted white.
Must be made of steel.
TRANSMISSION
O.E.M. three-, four-, and five-speed and automatic production-types allowed.
“In and out” boxes are not allowed.
Must all be clutch-operated.
Bert and Binn transmissions are allowed. With motor running and racecar in stationary position, driver must be able to engage racecar in gear and move forward, then backward, at time of inspection.
Clutch must be inside of bell housing for O.E.M. production-types.
One (1) forward gear and one (1) reversal gear must be in working order, plus a neutral position, and must be able to be shifted by driver.
Clutch-type transmissions must be equipped with an explosion-proof steel bell housing. Aluminum must be SFI-approved (GM bell housing is not SFI approved).
Automatic, Bert, or Brinn transmissions must have a guard two-hundred seventy (270) degrees around flex plate or flywheel, and must be constructed of at least one-quarter (1/4) inch steel. Alternatively, automatic transmissions may utilize an SFI-approved aftermarket guard.
All racecars must have the capability of starting without being pushed or pulled.
REAR END
Any passenger car- or truck-type is allowed. No aluminum allowed except lowering blocks, axle cap, and drive plate.
Quick change is optional: Steel tubes only; ten (10) inch ring gear only; pinion and carrier bearing must be tapered; titanium is not allowed; wide-five wheel patterns are not allowed; aluminum spools are permitted. Magnesium will be permitted until such date that the cost increases, at which time only magnesium rear ends purchased prior to that date will be permitted and must have original serial number.
No cambered rear ends (one-piece drive flange only).
No traction devices allowed (includes Gold Track, True Track or similar type components).
ENGINE
Must be able to be used in conventional passenger car without alteration. Motor mounts may not be removed or altered. Castings and fitting may not be changed. Machine work on outside of engine, or on front or rear of camshaft, is not allowed.
No total “dry sump” systems allowed. “Wet” system must be operative.
Cooling system may be modified. Radiators and oil coolers must not protrude above interior.
Any American make may be used. Rear of engine (bell housing flange) must be mounted at least seventy-two (72) inches forward from the center line of the rear axle- no tolerance.
Offset must be within two (2) inches of centerline of front cross member.
Must be a minimum of eleven (11) inches from ground to front center of crankshaft.
Steel blocks only – no aluminum or titanium.
Overflow tubes must directed towards the ground and inside the frame rails.
Radiator must be mounted in front of engine.
Wiring elements must be accessible for technical inspection. Any racecar advancing spots and missing will be subject to disqualification.
Exhaust system and mufflers must be mounted in such a way as to direct spent gases away from the cockpit and away from areas of possible fuel spillage. Mufflers are required.
Other Engines: If utilizing aluminum heads, racecar must have fifty (50) pounds in front of mid-plate; split between sides of motor.
WEIGHT
Total weight 2450 lbs; no burn-off; If running aluminum heads must have 50 lbs in front of motor plate: Must be 25 pounds on both sides
Ballast: May not be mounted in cockpit, or outside of body or hood area. Must be securely mounted, painted white and clearly marked with the car number. Must be attached with at least two (2) one-half (1/2) inch bolts. May not be attached to rear bumper.
SAFETY
It is recommended that each racecar have built-in fire extinguishing equipment, but cannot be of the dry powder type (must be Halon 121 or equivalent).
Drivers should have in their pit area as part of their equipment, at all times, a fully charged dry chemical, Halon (or its equivalent) fire extinguisher. Ten (10) or thirteen (13) pound fire extinguishers are highly recommended.
Driver must wear required helmet, fire suit and five-point safety harness whenever the racecar is on the racetrack. This includes during track packing, warm-ups, hot laps, and races.
Helmets are mandatory and must be approved SHCA or Snell-type full coverage. Helmets should accompany driver and racecar at time of inspection. Helmets at least Snell SA2000 or SA2005 rating are mandatory.
Complete one- or two- piece fire suits of a flame retardant nature must be worn by all drivers at all times when the racecar is on the racetrack. This includes during the track packing, warm-ups, hot laps, and races.
SFI-approved fire-resistant gloves and shoes are mandatory.
Five-point safety belts, sub-belt and shoulder harness is required. Factory-type shoulder belts or straps are not allowed.
Metal to metal buckles are required on shoulder and seat belts.
Shoulder harness must be mounted securely to the roll cage. It is recommended that seat belts and shoulder harnesses not to be more than one (1) year old.
Where the belt passes through the seat edges, it must have a grommet installed, be rolled and/or padded to prevent cutting of the belt.
Full-size window net mounted in the left side driver’s window opening and/or approved racing arm restraints are required. Window net mounts must be welded to the roll cage. All bars around the driver must have approved roll bar padding. If driver is utilizing arm restraints and official can pull driver’s arm out of cockpit, driver will not be allowed to compete.
Fire-resistant safety neck collars are required.
Head and neck restraint highly recommended.