STOCK 4
1. Body: Stock auto only. Inter panel may be removed; must have stock front firewall in stock location and floor pan.
Must have rear firewall or driver compartment must be boxed in. Rear of car must be closed (No holes or flaps) and
Aluminum doors and fenders okay; must retain stock shape and appearance; aftermarket nose okay. Must run hood;
must run rear deck lid. May have 2 ½" hood scoop must be boxed in. No ground effects or skirts NO WEDGE BODIES!
2. Chassis: Must have roll cage and all safety equipment cage must be secured to unibody; may tie chassis together
on top of floor pan only.
3. Suspension: .: Must be stock suspension. No screw jacks, racing springs ok. Lowering blocks OK; adjustable cups
ok(springs must be in stock location). May run spring buckets, caster and camber plates OK. May cut A frame for
caster & camber, Steel body non adjustable Racing shocks or struts OK; must be in stock location on stock mounts.
NO heims. May change pinion angle by cutting rear top control arm only. Bushings may be steel or nylon. Pan hard bar
may be cut but must have stock ends, non adjustable.
4. Rear End: Any stock up to 7.5" for make of car; NO lightening allowed. Gear must have factory production # or logo.
May lock. NO full spools, mini spools ok. NO gun drilled axles. Axles subject to compare to known stock. Housing
cannot be modified for gear clearance.
5. Brakes: Stock for make of car; may have racing pedals one master cylinder ; NO adjustment, all four wheel working
brakes. NO drilled rotors or drums lightened on the outside.
6. Wheels: Any steel up to 7". May be reinforced. Large wheel studs okay. Bead lock will be allowed on right rear only.
7. Tires: 60 or 70 series across the counter street tire. NO racing recaps of any style. Must punch 60.
8. Drive shaft: 1 1/2" OD or larger steel. Must be painted white with car number on it.
9. Transmission: Stock. Must have all working gears. Must have safety loop.
10. Flywheel: Stock must weigh 16 pounds no scalloped flywheel. Must have stock or stock replacement clutch and
pressure plate 7.5 "Min. Replacement clutch and pressure plate. (May balance with weld or drill holes only and must be
outside of clutch disc ring) Studs for pressure plate ok. Cannot relocate bolt hole pattern.
11. Engine Location: Stock. NO engine set back!
12. Fuel:Track Fuel only!!! Must pass track test. Fuel tank must be mounted inside of trunk. .
13. Weight: 1 pound per CC, (2000 lb minimum) Car's CC must be posted on hood. Must have correct CC for the
engine you are running. Formula for cc's Bore x Bore x .7854 x Stroke 4 = cid. Then divide by .061. (Tech man will
allow 5cc's for wear only).
14. Engine Specs: No rotary or turbo or double OHC permitted (NO vacuum Pumps).
* Block: OEM only .080 over bore maximum.
* Crank: Stock Crank. Stock stroke. No knife edging or lightening of any kind allowed. Main or rod journals can't be
turned more than .040" under stock.
* Rods: Any steel.
* Piston: Any flat top. Toyota 1600 & 1800 may run dome of .235" max. 20R may run dome of .125" max.
* Oil pan: Any wet.
* Heads: OEM many be changed from one size engine to another. May have competition valve job, any angle, and any
depth. Valve guide boss must remain stock. All angles must be concentric with valve guide.
* Valve: Any steel valve stock diameter under cut stem OK.
* Valve Springs: Single spring with damper; must be steel. Doubles ok.
* Retainers: Any steel.
* Cam: Max Lift .425" with .025" lash at valve for solid and 0 lash for hydraulic, no rollers.
* Lifter: Stock and diameter. Solid OK.
* Intake: OEM only; may be bored straight down for clearance, no radius or blending. No fuel injection manifolds except
for Chevrolet and any other engine which came only with fuel injection. May modify for carburetor, but must be
approved before race.
* Fuel Pump: Stock or electric.
* Carburetor: Stock 4 cylinder carburetor for make of car. Must have air horn with #, may cut end of screw, No thinning
of shafts, No grinding or polishing. Or Holley 350 CFM (#7448 or 0-80787-1) Must have air horn with #, must pass
track gauges. Float bowl must face towards front of engine. 22R ok on Nissan.
* Adapter: Can run 1" max thickness adapter for carburetor with 2 gaskets only @ .070" max thickness each or may
run 1 stock gasket with out adapter.
* Ignition: Stock. Mel's ignition ok. Billet ok. Crank trigger ok for Chevy.
* Header: Stock cast iron exhaust manifold only.
* Water Pump No electric pumps allowed
* Protest: (Two things only) $300.00 with track retaining $100.00
* Bottom end only protest: $400.00 with track retaining $100.00