2013 LIMITED MODIFIED RULES

RULE BOOK 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 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.

1. BODY AND CHASSIS FOLLOW UMP RULES, may have right front brake shut off. 5 inch coil overs on rear.

2. BLOCK:
Any American V-8 cast iron factory production block as supplied by manufacturer.
May use 1 or 2 piece rear main seal block.
NO aftermarket blocks of any kind.
NO 400 blocks.
NO stroking or destroking.
Block may be zero decked; piston can NOT protrude above deck surface.
Block may be 2 or 4 bolt NO splayed main caps.
Block may be bored 0.60
NO crate motors.

3. CRANKSHAFT:
Factory OEM stock steel or cast
May use aftermarket steel or cast.
Must weigh minimum of 48 lbs.
May use speedway part # 15-15350 or Scat part # 915-104420.
May balance rotating assembly.
May add weight to balance.
NO grinding or polishing.
NO knife edge crank.
Chevy 3.48 stroke.
Harmonic balancer, Minimum 6.75 inch diameter, must be modular iron OEM style, with
Elastomer insert. NO fluid dampers or 1 piece dampners, must be steel.

4. RODS:
Factory stock appearing rod.
NO H BEAMS.
May use floated pin.

5. PISTONS:
Any stock appearing 2 or 4 eyebrow piston, may be cast or forged.

6. The total minimum weight of piston, rod and wrist pin = 1194 grams.

7. CAMSHAFT AND LIFTERS:
390/410 hydraulic only, NO anti pump up lifters, must be stock OEM replacement, factory firing
Order only NO 4/7 swap cams. Timing chain and gear, double roller OK, cam button OK, rear
Bearing on cam gear OK.

8. PUSH RODS:
May use 100/1000 longer push rods.

9. ROCKER ARMS:
Stamped steel 1.5 ratio only, NO 1.52, NO 1.6, NO roller tips, May use speedway part #
287-11801

10. HEADS:
OEM factory open chamber ONLY.
Valve size 194/150. NO angle milling of heads.
NO aftermarket heads of any kind.
NO vortec.
NO 2.02
NO Cleveland's.
NO closed chamber.
NO angle plug heads.

10A. OPTIONS:
72cc minimum
Pinning of studs.
Maximum stud diameter 3/8 inch.
Screw in studs OK, 3/8 inch.
Guide plates OK.
Maximum valve stem diameter 11/32,
Valve springs maximum diameter 1.250.
Factory stock length valves only.
3 angle valve cut OK.

10B. HEAD GASKETS:
Minimum thickness 0.40, NO TOLERANCE!!!!!

11. DISTRIBUTOR:
Must remain factory stock except for the following options:
May recurve distributor.
May use MSD module part # 547-83641.
May lock vacuum advance.
May run hot coil, may use MSD part # 547-8220.
May use MSD distributor part # 910-12341.
NO small body distributors.
NO MSD boxes.
NO traction control.
May run bronze gear.

12. CARBURETOR: SINGLE FEED
ALLOWED CARBS AS FOLLOWS:
Holley 4412, must be as it came from manufacturer stock production, except for the following
Options:
May use 50 cc accelerator pump.
May change power valve.
May change jets.
Must be stock metering block.
NO high performance metering blocks.
NO billet metering blocks.
Must have stock air horn, unaltered.
Must pass NO GO gauges.
NO drilling of throttle plates.

12A. Holley 0-1850 VAC. SEC. ONLY. Factory stock except for the following options:
May use 50cc accelerator pump.
May change power valve.
May change front jets.
May use fuel log. SINGLE FEED
Front metering block must be stock.
NO high performance metering blocks.
NO billet metering blocks.
May open rear jet orifaces to adjust secondary fuel circuts.
May use rear jet plate SMI part # 85-599 COST $1.95.
NO rear metering block.
NO center hung float bowls.
NO drilling of throttle plates.
Must pass NO GO gauges.
Must have stock air horn, unaltered.

12B. Quadra jet must be OEM factory stock except for the following options:
Removal of choke plates, shaft, and choke mechanism.
Side load or front load OK.
NO internal drilling to modify metering circuts.
NO drilling of throttle plates.
IN THE ABOVE CARBURETOR RULES THESE ARE THE ONLY OPTIONS, ANYTHING
ELSE WILL RESULT IN A DQ.

12C. NO air boxes, NO inside breather devices that redirect air flow.

13. INTAKE:
Any steel or aluminum 2 bbl or 4 bbl.
Untouched out of the box.
NO gasket matching.
NO porting.
Must use only 1 gasket per side.
NO gasket stacking.
May drill and tap intake for bypass cooling hoses if necessary.
NO home make or custom intakes.
All intakes MUST have legible casting numbers.

13A. INTAKE AND ADAPTER:
In the event the carb and intake combination you are using requires an adapter it must be a
Maximum thickness of 1 inch including gaskets, it must be a MR GASKET inexpensive part.
NO spacers of any kind.
If carb will bolt to intake without an adapter the maximum thickness of gasket is 5/16 inch.

14. FUEL PUMP:
Any stock mechanical type OK.
NO piston style pumps.
NO vane type.
Fuel pump must be mounted in stock OEM location on engine block.

15. FUEL
87 to 93 octane only, must have 5% to 10% ethanol content (and we can test it at track)
NO additives of any kind.
1st offense with wrong fuel- 10 point penalty and $50.00 fine.
2nd offense with wrong fuel- Loose all points and monies for that race night and $125.00 fine.
3rd offense with wrong fuel- Loose all points for season, $250.00 fine.

16. POWER STEERING PUMP:
Pump must be mounted in stock or close to stock location on front of engine.
NO rear fuel pumps.

17. EXHAUST:
Any header must run parallel to ground.

18. FLYWHEEL, CLUTCH AND PRESSURE PLATE:
Minimum 10.5 clutch disc.
Must be stock in appearance.
May have damper springs or solid center.
NO light weight disc.
NO finger disc.
Factory stock flywheel.
May use finger or diaphram pressure plate.
May use hydraulic release bearing.
MANDATORY BLOW PROOF BELL HOUSING.
Minimum weight for clutch, pressure plate and flywheel is 35lbs.
NO TOLERANCE!!!

19. TRANSMISSION:
Any OEM cast steel factory stock 3 or 4 speed.
Must have all working gears.
NO lightning of gears or internal parts.
Automatic must be completely factory stock must have full size torque converter.
NO shift kits.
NO power glides.
NO torque converter eliminators.

20. PROTESTS:
Driver or car owner may protest winner, not both only one person may protest, and is to go to tech man with cash and written protest form of what you want to protest. You have 10 minutes from the completion of the feature event. If more than one person from the protesting racing team comes to tech area the protest will be voided.
$500.00 for engine ($75.00 to tech)
$350.00 for heads and top ends ($75.00 to tech)
$75.00 for clutch, flywheel and transmission.

IN THE ABOVE RULES THE OPTIONS ARE STATED ANYTHING ELSE WILL RESULT IN A DQ.

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