GM Performance Parts SB-Chevy Aluminum Race Blocks


GM Performance
GM Performance Parts SB-Chevy Aluminum Race Blocks

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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 locations
  • Cam bosses are enlarged to allow machining for the use of larger bearings
  • Extra thick main bearing bulkhead machined at 5 degrees
  • 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 spun 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



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      809-10134400
    		400 Aluminum Bare Block
  • CNC-machined, A-356 aluminum competition block
  • Splayed 4-bolt steel mains
  • Increased wall thickness with siamesed bores
  • 4.117" rough finished bore
    More info on GM Performance 10134400
    		• $4,987.99
    Ships
    02/21/12

    		809-10185075
    		350 Aluminum Bare Block
  • CNC-machined, A-356 aluminum competition block
  • Increased wall thickness with siamesed bores
  • 3.986" rough finished bore
    More info on GM Performance 10185075
    		• $4,926.99
    Ships
    02/21/12