RSCS Engine Rules

RENEGADE SPRINT CAR RACESAVER SPEC HEAD AND ENGINE RULES

ENGINE RULES:

Blocks must be GM 305 V-8s with approved casting numbers in place. 361979 -460776 - 460777 - 460778 - 14010201 -14010202 - 14010203 - 14088551 - 14016381 – 355909.
Maximum C.I. 315.9, NO TOLERANCE. Max. Stroke 3.480+- .020 max. bore 3.801. CANNOT MAX. BOTH (do the math).
Flat top pistons with valve reliefs, cannot protrude from cylinder bore.
Crank, cast iron or steel, minimum weight 48 lbs., 1% tolerance. Minimum main bearing diameter 2.450 - .030. NO weight added to crank w/exception of balance metal which must be welded in place.
5.7” steel rods, minimum rod journal diameter 2.100 - .030.
Plain hub or SFI approved damper. Stock location water pump.
Flat tappet cam, stock diameter tappets (.842) NO roller, hydraulic, or mushroom or radius tappets.
Cam; original material, configuration and firing order (18436572) No billet or hardened camshafts.
Valve spring specs: Only straight wound springs with flat damper. Max. Dia. 1.265”, Min. dia.1.200”. Max. Installed ht. 1.825”, Min. Installed ht.1.650”. Maximum free length allowed. 2.120”, Min free ht.1.900”. ABSOLUTE MAX. SPRING PRESSURE: @ Seat 120 LBS., @ 0.500 lift 355 LBS. Maximum wire diameter 0.195”. Minimum full number of coils 5.
Wet sump, internal pump only. No crankcase vacuum systems.
Roller rockers allowed. NO shaft systems. 3/8” stud mount rockers only.
Absolute maximum valve lift: .510” intake - .535” exhaust, measured at zero lash at the valve retainer.
No stud girdles, rev kits, or other valve train stabilizers. Tappet access for inspection required.
No repositioning, boring or bushing of cam or lifter bores. Maximum cam diameter 1.869” + .002”.
Valve sizes: Intake 1.94, Exhaust 1.600, Stem 11/32”, original length and weight, NO altered or hollow stems.
Ferrous material only: Valves, Retainers, Keepers, Push Rods, Springs, Tappets, Cam and cam drives, Crank, Rods, Wrist pins, Fasteners, Main caps. NO titanium or ceramics in engine.
No camshaft gear or belt drives. Chain may be roller type. No device to vary cam timing.
Ignition systems: Magnetos, electronic ignitions or Kettering type. NO crank triggers.
Constant flow butterfly type fuel injection only.
RaceSaver 305 SPEC head: Absolutely NO changes. NO machining, milling, resurfacing, grinding, NO polishing, welding, acid or caustic work, shot peening, glass beading, coating, or any other process that will alter the machined surfaces or the natural sand cast finish. Must retain all original dimensions & configurations including: Valves, springs, retainers, stems & guides. The ONLY work allowed is: Reseating the valves. NO top cuts that extend into the aluminum of the chamber. NO under the seat relief cuts. NO work that enlarges the as delivered throat size, 1.810 int. & 1.345 exh. (+ or - 0.10). NO bowl changes. NO CHANGES! Every dimension of these heads has a gauge dimension that must be met for them to be certified. Change any one of them and you will be disqualified. The stamped identification marks may not be altered.
Compression Ratio: 10.25 to 1 absolute maximum. C.R. checked w/Whistle or by pouring the assembled cylinder. Absolute minimum assembled cylinder volume: 70 cc. Heads may NOT be milled!!! Only exception is pre-approved milling to repair surface. All repairs MUST be pre-approved. Contact RACESAVER @ 540-923-4541 before attempting repairs. A repair authorization number will be issued. After repair, heads must be re-certified and marked accordingly. Original serial numbers and certification marks must be intact. They may not be altered or obscured. Any & all repairs MUST be pre-approved and heads re-certified. If any spec head is found to be modified, it must be REPLACED with a certified spec head.
The spirit and intent of the RaceSaver 305 SPEC Engine Rules will prevail.