Modifieds

Last updated 1/19/17

 Safety

  1. Helmets are required and must be a minimum of SA2010 with certification label inside helmet.
  2. Helmets must be worn at all times car is on track
  3. SFI approved flame/fire retardant fire suits, gloves and shoes are mandatory
  4. An approved head/neck restraint system is mandatory (Hans, G-force, Hutchens or SFI rated neck collar
  5. Nomex underwear is highly recommended
  6. Seat belts and shoulder harness cannot be more than three years old
  7. The date of manufacture should remain visible at all times
  8. A lever-type quick release latch must be fastened to the lap belt
  9. All seat belts and shoulder harnesses must connect at the lap belt with a quick-release buckle acceptable to series officials
  10. Only custom manufactured racing aluminium seats acceptable to officials
  11. All seats should have padded rib protectors
  12. All seats are required to have a head rest on the right side
  13. All belts must be a minimum of TWO (2) inches wide
  14. Belts must be bolted to the roll cage with no less than 3/8inch bolt
  15. A center, crotch belt must be securely mounted to the lower seat frame at the bottom and to the lap seat belt on the top
  16. Where the belts pass through the seat edges, it must have a grommet installed, be rolled, and/or padded to prevent cutting of the belt
  17. Window nets are mandatory
  18. Windshield must have three (3) bars in front of driver.

 Frame

  1. 1964 or newer perimeter American rear wheel drive passenger car frame only – no sports car frames
  2. Frame must be full and complete – cannot be widened or narrowed and must be able to support roll cage on both sides ALL FACTORY HOLES MUST BE PRESENT FOR INSPECTION. ALL MEASUREMENTS MUST BE WITHIN ONE HALF {0.5} INCH {EITHERWAY} OF OEM MEASUREMENTS. NO TOLERANCE – Exception: weight jack in original center line of spring tower allowed
  3. Frame may be cut a maximum of 36” forward from center of rear end housing
  4. Horns may be removed in front of steering box
  5. Front cross member may be notched and boxed for radiator and/or steering clearance
  6. Maximum seven inch wide opening in side of spring tower for spring removal
  7. Maximum two inch wide by four inch tall frame stiffener may be welded directly to outside of left side frame rail
  8. Minimum wheelbase is 108 inches and maximum 112 inches on both sides
  9. Maximum overall width (front or rear) shall not exceed 78 inches from outside of tire to outside of tire
  10. No part of frame can be lower than four inches from ground except front cross member
  11. RIGHT FRONT FRAME RAIL MUST BE MAX. 7.25 INCHES ABOVE GROUND.

Roll Cage

  1. Must consist of continuous hoops
  2. Minimum 1.50 inch O.D. tubing with a minimum wall thickness of 0.095 inch for main cage
  3. Frame mounted in at least six places – low carbon or mild steel recommended
  4. Must consist of a configuration of front, rear, and top hoops connected by tubing on sides or side hoops
  5. Driver’s head must not protrude outside cage with helmet on
  6. Roll cage must be securely supported and braced with minimum one cross bar in top halo
  7. Foot protection bar required
  8. Main cage no further forward than rear of engine
  9. All bars forward of cage must be lower than hood

 Driver Compartment

  1. Must have minimum three windshield bars in front of driver
  2. Aluminium high back seat only and must be bolted in next to left side frame rail ahead of rear tires
  3. Bottom of seat cannot be lower than bottom of frame rail
  4. Driver must be sealed off from track, driveline, engine, fuel cell, canisters, and pumps
  5. Oil coolers must not protrude above interior
  6. Accumulators cannot be mounted between driver and left side door bars
  7. No driver adjustable devices while car is in competition except brake adjuster
  8. No mirrors or reflective sun visors

 Steering & Suspension

  1. All components must be steel, unaltered OEM, in OEM location, and replaceable by OEM parts except tube-type upper A-frames with aluminium/steel cross shaft and mounts can be moved
  2. OEM replacement tubular control arms OK
  3. Lower A-frames must be right and left and of same design: rubber, nylon or steel lower A-frame bushings, no offset or bearing type, welded or bolted shock mount on lower A-frame, ALL PARTS MUST MEET ALL OEM SPECS & MATCH SIDE TO SIDE
  4. Lower A-frame mounts and bolt holes on frame must be in OEM location
  5. All components must be steel, unaltered OEM, in OEM location – except outer tie rod end and adjustment sleeve may be replaced by a minimum 0.625 inch steel rod end and steel tube – spindles can be ground for brake calliper clearance only
  6. Unaltered OEM replacement Pinto spindles, raised cast, spindles must be right and left and of same design
  7. Bolt on spindle savers allowed
  8. Steel steering shafts and knuckles only
  9. Steering quickener, steering wheel, and quick release may be aluminium
  10. Cockpit steering may be modified and must be kept on left side
  11. No rack and pinion
  12. One steel, non-adjustable, unaltered shock per wheel; SHOCKS MUST BE MOUNTED VERTICALLY & NO MORE THAN 20 DEGREES {90 DEGREES IN ANY DIRECTION}
  13. One additional shock allowed on rear suspension
  14. No threaded body, front coil-over, air, or remote reservoir shocks
  15. No homemade coil-over used anywhere
  16. Steel or composite leaf spring allowed
  17. One coil and/or leaf spring per wheel only.
  18.  Progressive spring allowed on pull bar or lift bar only.                                                      
  19. Any coil spring minimum 4.5 inches O.D.
  20. No torsion bars or air bags
  21. All components must be steel
  22. All trailing arms/link bars must be solid tubing
  23. Rear of frame may be altered to accept leaf or coil springs
  24. Steel coil-over eliminators or steel/aluminium coil-over kits allowed
  25. Must conform to shock and spring rules
  26. All suspension parts must be visible on both ends
  27. Only one (1) mechanical traction device is permitted. Only one (1) pull bar or one (1) lift arm is permitted. No other options will be permitted.
  28. Floating, pivoting and/or rotating mounts or brackets of any sort (connected or associated to the pull bar or lift arm) are not allowed.
  29. Lift Arm is defined as solid steel triangulated bar that is connected at the top (with one heim) and bottom (with one heim) of the rear end housing, extending forward where it is connected to a shock (that may utilize only the heim directly related to that one shock (ONE ON EACH END), shock spring coil over combination (that may utilize only the heims directly related to that one shock (ONE ON EACH END) and a limiting chain (with or without a biscuit for cushion). Only one heim is permitted in this configuration. One stabilizer bar is permitted to locate the front of the lift arm from left to right in the car.
  30. Pull Bar is defined as a continuous assembly (that may or may not contain a spring or biscuit assembly located in line to absorb torque) that is connected to the top of the rear end with one heim and extends forward to a solid mounting point located on the chassis where it is connected with one heim. The mounting location at both the front and rear of the pull bar may be adjustable but must remain constant during competition (cannot be adjustable from the cockpit).
  31. Bump stops (rubber and/or spring-type), spring rubbers or any other limiting devices are not allowed on any suspension component including, but not limited in relation to: shocks, springs, upper or lower “A” frames (Exception; bump stops and/or various rubber biscuits are permitted in conjunction with the pull bar or lift arm assemblies only, limiting chains or blocks from rear-end housing to chassis, and one (1) rubber bushing on front shock is allowed no more than one-half (0.5) inch in total rubber thickness, plastic or steel shims and or cups only.

 Rear End

  1. Any approved OEM passenger car type or truck rear end may be used
  2. Floaters & Steel tube quick changes allowed
  3. No aluminium allowed except lowering blocks, axel caps, drive flange, quick change rear end parts and bearing covers.
  4. Rear ends must be locked with a steel mini spool, full steel spool or welded gears
  5. Steel axels only
  6. One piece driving flange only
  7. No torque dividing differentials
  8. No scalloped ring gears
  9. Minimum ten (10”) inch ring gear only on quick changes-aluminium spool ok in quick change only
  10. No titanium or aluminium birdcages
  11. No wide five hubs
  12. 12. Axle Housing Mount (Birdcages)
    a) Only one (1) birdcage per side is permitted. Birdcage may consist of multiple barrels but must bolt or be welded together to act as a single unit containing both the top and bottom radius rod connectors.
    b) All bearings pertaining to birdcages must freely spin forward and backward.      c) One additional floated birdcage-style bracket is permitted per side to accommodate floated brake system only (one additional radius rod is permitted to control this bracket).
    d) Floating, pivoting and/or rotating mounts and/or brackets of any sort on the birdcage are not allowed. All brackets or mounts must be welded or bolted solid. Cleaves-style rotating mounts will be permitted on birdcage only for mounting of shock and slider.

Bumpers/Rub Rails

  1. Steel only
  2. Bumpers must be used both front and rear at all times and welded or mounted with bolts
  3. Must be minimum 1.25 inch O.D. tubing
  4. 0.065 wall thickness on front
  5. 0.095 wall thickness on rear
  6. Two-bar front bumpers must be mounted frame-end to frame-end no wider than width of material outside frame horns and with bottom loop parallel to ground
  7. Top bar must be directly above bottom bar, minimum 6.5 inches apart, measured center to center
  8. Rear bumper/nerf bars can’t be wider than tires.

Tires and Wheels

  1. Hoosier A40, H40, A40S or G60…NO GROOVING OR SIPING ON THE A40S
  2. Beadlock right side only
  3. Any 8” steel wheel
  4. No softening or conditioning of tires is allowed
  5. Tire durometer cannot read less than 50pts after race
  6. NO Bleeder Valves
  7. Wheel covers are permitted on right side wheels only (5 fastener type recommended). Inner mud plugs are permitted. All mud covers must display car number on at least one side

Brakes

  1. Must be steel approved OEM, operative four wheel drum or disc
  2. Must maintain minimum OEM dimensions for hubs/rotors and callipers, cannot be lightened
  3. Bolt pattern may be changed
  4. Larger studs mandatory (5/8)
  5. Rear rotors may be aftermarket, minimum 0.810 inch thickness
  6. Vented rotors only
  7. No scalloped rotors
  8. No brake shut-off or pressure sensitive devices
  9. One proportioning device allowed, front to rear only
  10. Brake lines must be visible
  11. Steel or aluminium single piston OEM type callipers are permitted (piston diameter must be the same on all callipers)

Exhaust

  1. Round tube headers only
  2. Tri Y headers allowed…BUT NO stainless steel

Fuel System

  1. Racing fuel cell required, maximum 32 gallon capacity, must be in minimum 18 gage steel container
  2. Cell must be securely mounted behind rear axle, between tires, minimum of four inches ahead of bumper, minimum of ten inches above ground
  3. Must mount with minimum two 0.125 inch thick solid steel straps, two inches wide around entire cell
  4. All cell mounts must be steel, securely welded to frame/cage
  5. Protective tubing must cover rear and extend past both sides of cell
  6. No part of cell shall be lower than protective tubing
  7. Fuel cell vents, including cap, must have check valves
  8. Pick-up must be on top or right side of cell
  9. Limit one fuel filter
  10. No cool cans
  11. If fuel cell does not have aircraft style positive seal filler neck/cap system, a flapper, spring or ball type rollover valve is required

 Fuel

  1. Gasoline or alcohol
  2. No performance enhancing additives
  3. Upper cylinder lube allowed
  4. Fuel sample may be taken from any car at any time

Battery/Starter

  1. One battery only
  2. Must be shielded and securely mounted between frame rails
  3. Must have capability of starting without being pushed or pulled
  4. Must leave initial staging area on demand, unaided or go to rear of that race

Gauges/Electronics

 No transmitting or listening devices in car except race receivers which ARE MANDATORY!! No exceptions! ZERO TOLERANCE!! NON-WORKING OR LISTENING DQ!!!

  1. Cameras pointing to any moving or suspension parts are not allowed. Except for memory recall tachometer, electronic monitoring computer devices capable of storing and/or transmitting information are not allowed.
  2. Only one 12volt ignition box allowed; ignition box must be located outside of cockpit in front of driver
  3. No additional ignition accessories allowed
  4. No timing retard controls allowed
  5. No traction control devices
  6. Any car suspected of running a traction control device or unusual handling characteristics can be pulled out of competition and not allowed to race
  7. No bundling of wires, all wires must be open and visible

Transmission/Drive Shaft

  1. Must have at least one gear forward and one reverse, plus a neutral position
  2. With motor running and car in a still position, driver must be able to engage car in gear and move forward, then backward
  3. Bert, and Brinn transmissions will be allowed as well as any OEM transmission
  4. No five-speed transmission, “in or out” boxes, or quick change devices allowed
  5. Functioning shifter must be in stock location on transmissions manufactured after 1995
  6. All manual gear-type transmissions must have a standard OEM case and must have a working disc-type or approved cone-type clutch inside and explosion proof steel bell housing
  7. Automatic transmissions must remain in OEM stock appearing automatic case
  8. Original bell housing must remain
  9. Must have an approved scatter shield or blanket
  10. Scattershield may be constructed of 25-inch by 3-inch steel, 270 degrees around flex plate or flywheel
  11. NO ALIUMINIUM driveshafts -must be painted white
  12. Driveshaft must be at least 2” inches in diameter
  13. NO ball spline.
  14. CARBON FIBER DRIVER SHAFTS ALLOWED

Engine Compartment

  1. Rear of engine (bell housing flange) must be mounted at least 72 inches forward from centerline of rear axle
  2. Engine offset must be kept within two inches of centerline of front cross member with engine level
  3. Minimum 11 inch engine height from ground to center of crankshaft
  4. Radiator must be mounted in front of engine
  5. Cooling system may be modified

Engine Specifications

  1. Any American make engine allowed
  2. Steel block only
  3. No dual point distributors
  4. All engines must be able to be used in conventional passenger car without alteration
  5. Engine mounts cannot be remove or altered
  6. Castings and fittings must not be changed
  7. No machine work on outside of engine
  8. “Wet” oiling system only
  9.  CASTINGS (INCLUDES BLOCK, HEADS AND INTAKE) AND FITTINGS MAY NOT BE CHANGED. MACHINE WORK ON OUTSIDE OF ENGINE, OR ON FRONT OR REAR OF CAMSHAFT, IS NOT ALLOWED.
  10. INTAKE MANIFOLDS MUST BE MADE OF CAST IRON OR CAST ALUMINUM. EXTERNAL MODIFICATIONS TO CAST ALUMINUM INTAKES ARE NOT ALLOWED. INTERNAL MODIFICATIONS ARE PERMITTED.

ENGINE OPTION #1;

  1. ANY 23 DEGREE STEEL HEAD;
  2. 2400 POUNDS;
  3. 7INCH SPOILER;
  4. 8200 REV CHIP.

ENGINE OPTION #2;

  1. BRODIX SPEC HEAD
  2. APPROVED PRODUCT NUMBERSFOR THE BRODIX ALUMINUM SPEC HEAD ARE SPCH {CHEVROLET}, SPFO {FORD} & SPMO {MOPAR}.
  3. REMOVING, RELOCATING, GRINDING, POLISHING, AND DEFACING OF ANY CAST LETTERS AND/OR NUMBERS IS STRICTLY FORBIDDEN.
  4. VALVE GUIDES MUST RETAIN ORIGINAL ANGLE AND SPACING AS MANUFACTURED. VALVE GUIDES MAY NOT BE TAPERED, THINNED OR SHORTENED WHATSOEVER. MINIMUM VALVE STEM DIAMETER MUST BE FIVE-SIXTEENTHS (.310) INCH.
  5. ABSOLUTELY NO WELDING OR ADDING MATERIAL OF ANY KIND.
  6. ABSOLUTELY NO ENLARGING, RELOCATING OR OTHER ALTERING OF ANY BOLT HOLE, DOWEL HOLE, OR THREADED HOLE, EXCEPT TO SPOT FACE BOLT HOLES AFTER ANGLE MILLING.
  7. HELI COILS ARE PERMITTED FOR REPAIRS
  8. NO GRINDING OR POLISHING OF ANY KINDANYWHERE ON THE CASTING, EXCEPT FOR PUSHROD CLEARANCE. FACTORY CNC CHAMBER MAY NOT BE ALTERED IN ANY WAY.
  9. HEADS MAY BE ANGLE MILLED BUT VALVE ANGLE MUST REMAIN WITHIN ONE {1} DEGREE OF ORIGINAL MANUFACTERED SPECS.
  10. INTERNALLY-REPAIRED BRODIX ALUMINUM SPEC HEADS MUST BE RECERTIFIED BY BRODIX
  11.  BRODIX ALUMINUMSPEC HEAD CHECKING FIXTURES MAY BE USED BY TECH OFFICIALS TO CHECK SPECIFICATIONS AND DIMENSIONS.
  12. 2450 POUNDS WITH DRIVER AFTER RACE. WITH 50 POUNDS OF THIS IN FRONT OF MOTOR PLATE.
  13.  5 INCH SPOILER
  14.  8200 REV CHIP

ENGINE OPTION #3

ANY IMCA ENGINE PACKAGE

  1. WEIGHT 2400 WITH DRIVER AFTER RACE
  2. 7 INCH SPOILER
  3. 8200 REV CHIP
  4. THIS MAY BE ACCOMPLISHED USING ONE, NON-ADJUSTABLE, 12 VOLT IGNITION BOX WITH ONE HIGH END REV LIMITER SETTING OR AN INTERNAL SETTING INSIDE BOX. MSD #8728 REV CONTROL OR MSD #8738 ADDITIONAL REV CONTROL BOX ALLOWED. PRESET CRANE #6000-6478 IGNITION BOX ALLOWED. NO ADDITIONAL IGNITION ACCESSORIES ALLOWED. ALL COMPONENTS MUST BE OUT OF REACH OF DRIVER, BUT ACCESSIBLE FOR INSEPECTION. NO MAGNETOS OR CRANK TRIGGERS

Aspiration

  1. One two-barrel or one four-barrel carburetor OK
  2. Must be naturally aspirated
  3. No fuel injection
  4. No electric fuel pumps

 Weight

  1. Minimum weight limit SEE ENGINE PACKAGES – no tolerance – after race with driver.
  2. Weights must not be used in driver’s compartment or outside of the body or hood area
  3. Any weights added to other areas of vehicles must be securely mounted and must be painted white with car number on it, and attached with at least two 0.5 inch bolts
  4. No gun-drilled, tubular, hollow bolts or studs
  5. Steel fasteners only

BODY:

  1. 1970 or newer American compact passenger car only. Panel vans or station wagons are not allowed.
  2. An aluminum half-windshield may be used on driver’s side of the front window opening only.
  3. Stock appearing front window support units must be used (painted roll bars are not acceptable substitutes). Front window may have a support of no more than twenty (20) inches at bottom, going straight up to top.
  4. A minimum window opening of twelve (12) inches must be maintained on all four (front, back, left and right) window openings.
  5. Streamlining at top of windshield is not allowed. Bodies must have standard appearing windshield opening and corner post must follow standard configuration.
  6. Original roof line of vehicle must be maintained with a maximum of five (5) inches of slope from rear to front. No more than one-half (0.5) inch stiffener allowed at the rear of the roof and must turn down perpendicular to the ground. A maximum of one (1) inch roof lips allowed on outside edge of roof. A maximum of four (4) inch sides on roof allowed. OEM Gremlin roofs are not allowed. Aluminum roofs are permitted but must remain flat.
  7. Sail panels must be of matching design with matching styles on both sides of racecar. Sail panels may have a maximum bow of four (4) inches top to bottom, maximum bow of three (3) inches front to back and may be no more than eight (8) inches above the back edge of deck.
  8. Reverse hood rake is not allowed. Hood must be level or slope forward toward nose of racecar. Back of hood may be no more than two (2) inches above decking. Lips on the sides of hood are not allowed.
  9. Belly pans are not allowed. A belly pan will be defined as any object or material that alters the airflow under the racecar.
  10. Bodies with excessive damage (as determined by an official) will not be allowed to compete.
  11. Overall width of the racecar may not exceed 78 inches. Width shall be measured from the widest points on each side of the racecar.
  12. The rear deck lid and/or trunk area must be covered.
  13. A two (2) inch lip on the nose is permitted, but may go no further than leading edge of hood.
  14. Doors and quarter panels may be mounted a maximum of one (1) inch above the deck, and must match side to side – NO TOLERANCE.
  15. 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 up to eight (8) inches forward of the back of the engine block.
  16. NOSE MUST BE COMPLETELY WITHIN BUMPER.

Spoilers:

  1. Rear spoiler may not exceed the width of the rear deck lid, must be flush to the deck and must extend from right edge of deck to left edge of deck.
  2. Rear spoiler must remain separate from sail panels.
  3. A maximum of two (2) center supports and a maximum of two (2) side supports may be attached to the front of the rear spoiler (see body diagram for dimensions).
  4. Fins, wings, lips or other air spoilers (except as noted above) are not allowed.
  5. Any fins, wings, lips or other air spoilers permitted must match corresponding part on opposite side of racecar.
  6. SPOILER MATERIAL MUST REMAIN FLAT
  7. SPOILER 7”

Disclaimer: The rules and/or regulations set forth herein are designed to provide for the orderly conduct of racing events and to establish minimum acceptable requirements for such events. These rules shall govern the condition of all events, and by participating in these events, all participants are deemed to have complied with these rules. NO EXPRESSED OR IMPLIED WARRANTY OF SAFETY SHALL RESULT FROM PUBLICATIONS OF OR COMPLIANCE WITH THESE RULES or death to a participant, spectator or official. The race director shall be empowered to permit reasonable and appropriate deviation from any of the specifications herein or impose any further restrictions that in his opinion do not alter the minimum acceptable requirements. NO EXPRESSED OR IMPLIED WARRANTY OF SAFETY SHALL RESULT FROM SUCH ALTERATION OF SPECIFICATIONS. Any interpretation or deviation of these rules is left to the discretion of the officials. Their decision is final.