The GM Performance Parts aluminum race blocks offer you the same competition-level strength of our cast iron race blocks, with the added benefit of reduced weight. This allows your chassis builder to put together a more balanced racecar while not sacrificing any strength under the hood. The GM Performance Parts aluminum race blocks come CNC-machined, made from their super-tough aluminum, and ready to battle. If you want to go around corners at 200 mph or make over 1000 horsepower with a fuel-injected, turbocharged combination, this is your starting point.
GM Performance Parts Aluminum Race Block Technical Notes:These blocks are CNC'd to +/-.001" machining tolerances!Cylinder decks, front and rear of case, oil pan rail surfaces and head dowel pins are blueprinted!2.00" O.D. cam bearings (1.867" I.D.) P/N 12370843 required at all five locationsCam bosses are enlarged to allow machining for the use of larger bearingsExtra thick main bearing bulkhead machined at 5 degreesPremium quality main studs & SAE 8620 steel main bearing capsBillet wet sump rear main cap can be adapted to dry sump with plugsPriority main oiling system2-piece rear-main crankshafts & pre-1986 oil pans requiredExtra thick deck surfaces with blind-tapped head bolt holes for improved head gasket sealingCentrifugally spun cast iron cylinder sleevesThese blocks may require clearancing the top of lifter bores (.842" diameter) for some roller lifters)Timing system clearance should be checked before engine assemblyOil dipstick holes are not drilled
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