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 AND OR REGULATIONS. They are intended as a guide for the conduct of the sport and are in no way a guarantee against injury 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/her opinion does 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.

In the Limited Mod rules set forth below it is explained what you can do, ANYTHING else will result in being DQ'ED. NFS reserves the right to add weight to any car, any where at any time to keep all cars competitive.

ENGINE/TRANSMISSION; G.M. Small Block Chevrolet Engines Only.
1.BLOCK 350 GM Factory OEM cast steel, 2 or 4 bolt block, Maximum bore 0.60 plus 10/1000ths for wear, No grinding on inside or outside of block, may epoxy screen filters into oil drain back holes in lifter valley, No Bowtie blocks and No other aftermarket block will be allowed. Must be a 350 cubic inch block, No 400 blocks, block may be 1 or 2 piece rear main seal, No 602 crate motors, block may be zero decked, No part of piston can protrude above cylinder deck, NO STROKING or DESTROKING of engine.
2. CONNECTING RODS; Must be a 5.7 inch rod, I-beam rod only, may have thru bolts or caps bolts, rod may be floated, No 6 inch rods will be allowed, No polished rods, No aluminum rods, May use Scat or Eagle rods if they meet above stated rules.
2. PISTONS; Must be 2 or 4 eyebrow, must be stock wrist pin height for 5.7 inch rod, may be cast or forged.
3. CRANKSHAFT; Cast or Steel, Stroke must be 3.48 throw, 48lb MINIMUM WEIGHT, No knife edge, No cross drilled throws, May add heavy weight to crankshaft to balance, No grinding on crankshaft, No polishing of crankshaft counter weights, Must be stock appearing, must have casting number on crankshaft. May use Scat or Eagle crankshaft if they meet above stated rules.
3A. Harmonic balancer; Must be a minimum 6.75 inches in diameter and must be cast steel with elastomer insert, No fluid dampers, No solid balancers.
4. BALANCING; May balance rotating assembly, No grinding, may add heavy weight to balance.
5. CAMSHAFT; 390/410 lift, must be hydraulic flat tappet, No solid lift camshafts, No roller camshafts, No 4/7 swap cams,
6. LIFTERS; Must be hydraulic, No solid lifters, No anti pump ups, No mushroom lifters, must be stock lifter bore for 350 cubic inch GM.
7. PUSH RODS; Stock length and diameter.
8. ROCKERS ARMS; Must be stamped STEEL, 1.5 ratio only, No other size will be allowed, No roller tip, No roller rockers.
9. ROCKER ARM ADJUSTER NUTS; May use poly locks, No stud girdles will be allowed.
10. TIMING CHAIN AND GEARS; May use a double roller, may use cam bearing behind top gear, may use cam button, No gear drives, No belt drives, No adjustable cam or crank gears, May use multiple keyway crankshaft gear.
11. HEADS; Any factory stock, open chamber head, 1.94/1.50 valves only, Valves may have a maximum of 30/1000ths neck down, No undercut valves, No swirl polished valves May use stainless valves, minimum 72 cc combustion chamber, 3 angle valve cuts, valve stem diameter must be 11/32" No other size will be allowed, OEM stock length valve for 350 GM, 1.250 inch valve spring diameter only, No grinding on heads will be allowed inside or outside, may deck head surface with in 72 cc per chamber, may use screw in studs, studs must be 3/8 diameter, may use guide plates , May pin studs, No double hump heads, No Bowtie heads, No VORTEC heads, No closed chamber heads, No angle plug heads, No aftermarket heads of any kind, No SR heads, No porting or polishing.
12. INTAKE; Any cast or aluminum intake, must have casting number, may run water cooling lines, No porting, No polishing, No acid dipping, No handmade intakes, No gasket matching.
14. VALVE COVERS; May use aftermarket, EVAC system OK.
15. DISTRIBUTOR; Factory OEM Stock or you may use an aftermarket big GM, may change module, may use printed circuit module, may use hot coil, may lock advance, May use hot coil, No small MSD distributors, No billet distributors, No MSD boxes.
16. CARBURETOR; Holley 500, Holley 600 CFM single fuel line feed, Holley carburetor must have a stock metering block, may change accelerator pump to 50cc, may remove choke plate and shaft, may change jets, may change power valve, may use rear jet plate, may use quick change vacuum pod for secondary, No secondary metering block, No billet metering blocks, No billet base plates, No drilling of butterflies, No fuel logs. No Q jet carburetors.
17. CARBURETOR ADAPTER; If carb will bolt directly to intake you cannot run an adapter, gasket thickness maximum 5/16 inch, If adapter is required to bolt carburetor to intake the minimum thickness is to be 1.5 inches with gaskets, No carburetor spacers. Adapter must be metal or aluminum, No phenolic, wood or plastic, No adjustable front to back or side to side adapters.
18. FUEL PUMP; May use a racing pump maximum pressure 7 lbs. Must be mounted in stock location on motor, No fuel pump/power steering pump combo units.
19. WATER PUMP; May use aftermarket racing aluminum pump.
19A. WATER PUMP PULLEYS; May use aftermarket aluminum pulleys.
20. RADIATOR; Aluminum radiator OK.
21. EXHAUST; Headers will be allowed, Must have mufflers, No Tri Y headers.
22. POWER STEERING PUMP; Must be mounted on left front of motor (drivers side), No tandem fuel pump/power steering pumps.
23. CLUTCH/FLYWHEEL; Steel OEM replacement flywheel, 10.5 inch, may use solid hub clutch disc 10.5 inch, may use 10.5 inch pressure plate, minimum weight of flywheel, clutch and pressure plate 35lbs, this will include flywheel and pressure plate bolts, Will NOT include release bearing.
24. CLUTCH RELEASE BEARING, Hydraulic aftermarket OK.
25. TRANSMISSION; 3 or 4 speeds, cast iron only, must have all working gears, forward and reverse. No lightening of gears must be OEM stock.
26 FUEL; Pump gas only, No 110 or any racing fuel, fuel must contain 5 to 10% ETHYNOL, No Aviation fuel, No Methanol, Must pass NFS fuel test.
26A, Fuel Penalties;
1st Offense, Lose 10 points and $50.00 fine.
2nd Offense, Lose all points and monies from that nights events and $125.00 fine.
3rd Offense, Lose all points for the season and $250.00 fine.

1. UPPER A-ARMS; May use steel tubular aftermarket, cross shaft may be aluminum.
2. Lower A-ARMS; Stock OEM, Tubular lowers NOT ALLOWED.
3. CENTER LINK; Stock steel.
4. TIE RODS; Steel stock inners, may use SWEDGE tube and HIEM joints on outers.
6. STEERING BOX; GM for GM, FORD for FORD etc.
7. FRONT SHOCKS; One shock per wheel, steel welded body, split valve only, NO threaded body shocks, No adjustable shocks, No schrader valve shocks, No coil overs, No rebuildable, No take apart, No shocks with allen plugs or plugs of any kind, No custom built shocks, All shocks must have a part number that is clearly legible, and available in any performance catalog, All are subject to be sent to manufacturer to be tested, any shock that is found illegal will be confiscated and will become the property of North Florida Speedway to be disposed of. Approved shocks are Afco 1000, 1200, and 1500 series, or Bilstein 7 or 9 series, or Integra 4200 series, or Pro WB series, or Carrera 5500, 5900, 7500 series, any other shock not mentioned above must be preapproved by the NORTH Florida Speedway Tech Department.
9. SPRINGS; STEEL only, No composite.
10. Tubeular lower control arms are ok.

1, REAR SHOCKS; One shock per wheel, steel welded body, split valve only, No threaded body shocks, No adjustable, No Schrader valve shocks, No aluminum shocks, No take up shocks on either side, Coil overs OK, Sliders OK, see shock explanation for brand and series above in front shocks, Aluminum coil over kit OK, May run 90/10 shock on top link of rear end.
2. REAR SPRINGS; Steel only, NO composite, Coil or leaf, Must be same on both sides.
3. Leaf spring, coil spring, 3 link, 4 link, Z link, swing arm, mono leaf all are OK.
4. REAR END; 9 inch or Quick change OK, No ratchet differentials, No limited slip differentials, Must be locked, No aluminum tubes, center section on Quick change may be aluminum.
6. BIRD CAGES; OK, Must be steel, No aluminum.
7. BRAKE FLOATER; Not allowed.
8. SWEDGE TUBES; Must be steel.
10. J-BAR; Must be steel, biscuit or solid OK.
11. J-BAR mount on rear end and on frame may be steel or aluminum.

1. Must have 4 wheel operating brakes.
2. May use right front shutoff.
3. CALIPERS; Must be steel OEM stock, same size pistons on all, single piston only, No aluminum, No dual piston.
4. May run brake bias adjuster.
5. ROTORS; Stock type steel, No scalloped rotors.
6. May use aftermarket brake pedal assembly.


1. DECK: Maximum width 68 inches
2. DECK LENGTH: Must not go past engine mid plate in front and must stop 6 inches before inside edge of rear bumper.
3. Deck may have up to 3 inch taper from rear to front and from passenger door to drivers cockpit.
4. Minimum deck height 28 inches, Maximum deck height 38 inches
5. Spoiler width maximum 68 inches
6. Spoiler height maximum 6 inches, bends will not be taken into consideration as long as they are leven bends. If they have any angle upwards it will be included in the height measurement.
7. If spoiler is not incorporated sail panels the end piece maximum height will be 6 inches X ten (10) inches long.
8. Center spoiler brace maximum 6 inches high X 10 inches long. One (1) only
9. ROOF: Moaximum roof width 50 inches, maximum roof length 56 inches
10. Roof rake from rear to front 3 inches maximum.
11. Door and quarter panel bottoms must have a minimum ground clearance of 4 inches.
12. Door panels may extend 4 inches past top of front deck maximum.
13. NO closing in of engine compartment, NO air deflectors on chassis.
14. Front nose must not be wider than outside of front frame horns and must not go past the leading edge of front bumper. Minimum 6 inches from front nose to ground.
15. Window sails must start even at top of roof and taper in a straight line to rear spoiler must not protrude any higher than spoiler, solid window sails ok or you may cut out windows in sails you must cut both sides out not just one.

1. 8 inch steel wheels.
2. Hoosier 26.5 or 27.5. May be A,D,H or medium or hards. NO soft tires allowed.
3. NO grooving or prepping.
4. May use bead lock on any corner
5. NO other tire will be permitted.


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