Page 143 of GM Performance Parts 2006 Catalog by GM Parts Direct

Aluminum Race Block (rear) Aluminum Race Block (bottom) Aluminum Race Block (front) 141 ALUMINUM RACE BLOCKS 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 our special super-tough aluminum, and ready for 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.* See chart on page 132 for complete specifications. GM Performance Parts Aluminum Race Block Technical Notes: These blocks are CNCd 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 locations Cam bosses are enlarged to allow machining for the use of larger bearings Extra thick main bearing bulkhead machined at 5 Premium quality main studs SAE 8620 steel main bearing caps Billet wet sump rear main cap can be adapted to dry sump with plugs Priority main oiling system 2-piece rear-main crankshafts pre-1986 oil pans required Extra thick deck surfaces with blind-tapped head bolt holes for improved head gasket sealing Centrifugally spin cast iron cylinder sleeves These blocks may require clearancing the top of lifter bores (.842" diameter) for some roller lifters Timing system clearance should be checked before engine assembly Oil dipstick holes are not drilled 10185075 350 Aluminum Bare Block CNC-machined, A-365 aluminum competition block Increased wall thickness with siamesed bores 3.986" rough finished bore 4.150" max bore (siamese bores) 350 main size Tested to over 800 horsepower! 10134400 400 Aluminum Bare block CNC-machined, A-365 aluminum competition block Splayed 4-bolt steel mains Increased wall thickness with siamesed bores 4.117" rough finished bore 4.150" max bore (siamese bores) 400 main size Tested to over 800 horsepower! *Proposed applications have not been specifically tested or validated by GM Performance Parts.

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