2012 - LATE MODEL RULES
* STEEL HEAD & CRATE applies BELOW*
* CARBURETOR:Any 1 four barrel permitted. FUEL GAS OR E85 only
* IGNITION: Any point or electronic ignition. (No traction control
* WEIGHT: 2350 lbs 6” eng. setback max
* TIRES: REAR Tires (Must durometer 50 @ any time Front tires any Hardness :
* Body:Lucas body rule applies
(TRACK RETAINS RIGHT to adjust weight & let any CAR RACE)
RULES may be ADJUSTED TO EQUAL COMPETITION
PROTEST:
A .$400 Head & Bore
B.COMPLETE $600 Track retains 1/3
C . Visual (rule applies)
CRATE ENGINE OPTION
HEADERS MUST HAVE FOUR (4) TUBES INTO ONE(1) COLLECTOR OF A CONSISTENT DIAMETER. NO TRI-Y HEADERS
(crates may have up to 12" spoiler WITH 12"/32" LEFT side board)
APPROVED Repair & Rebuild Parts
A. Non-GM Parts - May be purchased directly from manufacturer:
1. Oil Pan - Available from Champ Pans - P/N -CP100LTRB
2. Oil Pump - Standard Cast Iron High Volume Must be small block pump.
3. Piston - GM P/N -10159437 available from MAHLE as P/N - 027520 must be used with wristpin supplied with this piston. No lightening (other than balancing) or alterations of any kind to piston or pin. No coatings. May overbore up to .030.
4. Piston Rings - GM Low tension racing ring of same composition, size& spec available through Hastings, TRW, Sealed Power, etc. No Gapless Rings.
5. Gaskets - Any brand oil pan, valve cover, and rear main seal are allowed. Intake gaskets must be same rigid plastic with rubber inlay seals as provided from GM P/N -89017465. No alterations to gasket are allowed. Cylinder head gasket must be same 0.051 compressed thicknesses as GM P/N -12557236. Intake and head gasket are available from Victor.
6. Aftermarket Valve Springs & seals are allowed. Must have GM valve spring retainers and locks. No additional or pressurized valve spring oilers permitted.
7. Engine bearings - Optional (coated or un-coated) No rollerized cam, rod, or main bearings. Clearance optional.
8. Timing Gear and chain - Available from GM or Cloyes P/N GM604
B. Mandatory parts you must use from GM
1. GM 54.5lbs Min. Crank P/N -14096036 repair re-grinding permitted. No alteration of stroke, rod, or main journal dia.
2. GM Cam P/N -10185071 No Nitriding, hard plating, or modification of any kind.
3. GM Rods P/N -12495071 must use GM rod bolts & nuts supplied with rod.
4. GM Balancer P/N -12555879
5. GM Push Rod P/N -12371041
6. GM Rocker Stud P/N -12371058.
7. GM Rocker Arm and nut P/N -12367345.
8. GM Lifters P/N -523890.
9. GM Intake Valve P/N -12555331
10. GM Exhaust Valve P/N -12551313.
11. GM Head Bolts P/N -12495499.
12. GM Block P/N -10105123
13. GM Spider and Lifter alignment retainer mandatory.
14. GM Intake P/N -12496822
15. GM Cylinder Head P/N -12497186
(14 & 15 must remain stock untouched)
Machine Work ALLOWED CRATE 604
Rotating assembly- may be balanced. Connecting Rod, Piston, and pin may not be less than 3 grams lighter than Factory spec. Crankshaft balancing may only be done by drilling or adding weight to the counter balance. No narrowing or Knife-edging to obtain balance. No aftermarket sleeve allowed. Minimum piston deck height 0.010. No angle milling, block will be measured on 90 degree intervals. May be line honed. Stock GM caps and bolts mandatory. No shot peening or heat treating of the caps. Stock push in Welch plugs may be replaced with screw in plugs. No rollerized cam bearings. No polishing of the block inside or out. Excessive casting debris may be removed. No performance enhancing coatings. No additional oil supply or enlargement of oil supply galleys. No oil restrictors of any kind. No plugging, drilling, or modification of the cooling system. No block fillers or strengthening materials. Standard push in soft plugs only, no spot welding, pinning, or locking device of any kind. Multi-angle valve job with minimum 44 degree and maximum 46 degree for primary valve or seat angle (blending angles top and bottom optional). Untouched portion of valve seat as comes from GM may not be enlarged or modified in any way. Depth of valve job lower cut may not exceed depth of original GM valve job. Surfacing of the head due to warp age repair is permitted. No angle milling of head. Volume of the port and radius measurements and all other aspects will be teched COMBUSTION CHAMBER 58 cc min. INTAKE PORT 210 cc max. EXHAUST PORT 82 cc max. Heli-coils protruding into intake port may be trimmed. Compression Ratio 10.0:1 Max… No deviation.
ANYTHING NOT WRITTEN IN THESE IS NOT LEGAL!
604 Crate Rebuild kits P/N PCH350D are available (with pistons $420) (without pistons $315), including rings, rod , cam , and main bearings, gaskets, seals, oil pump and oil pump shaft, brass soft plug kit, timing gear and chain kit with plastic cover. Available through Motor Warehouse in Sacramento CA.
Updated: 01/16/2012