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400 Aluminum Bare Block

Brand: Chevrolet Performance

Part Number: 10134400




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 Part number 10134400 has an additional freight charge of $24.95 per item due to its large size and/or weight.

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Aluminum Race Block

 Performance Aluminum Race Blocks

Less weight and the same great horsepower are the benefits of a Chevrolet Performance Aluminum Race Block. Chevrolet Performance Aluminum Race Blocks provide the same competition-level strength and reliability of our cast-iron Race Blocks, but their lighter weight improves chassis dynamics. The super-tough A-356 aluminum competition blocks are CNC-machined to +/- 0.001-inch tolerances. Chevy Performance Aluminum Race Blocks are ideal for road racing applications or high horsepower turbocharged engines.


10134400 Chevrolet Cylinder Block

400 Main Aluminum Bare Block

  • A-356 aluminum competition block
  • CNC-machined
  • Siamesed bores with increased wall thickness
  • 4.117" rough-finished bore
  • 4.135" maximum bore
  • 3.750" maximum stroke
  • Splayed 4-bolt steel mains
  • 400 main size
  • Dry sump use only
  • Tested to more than 800 horsepower!

Chevy Performance Race Block Technical Notes:

  • Extra-thick deck surfaces with blind-tapped head bolt holes for improved head gasket sealing
  • Centrifugally spun cast-iron cylinder sleeves
  • 2-piece rear-main crankshafts and pre-1986 oil pans required
  • Enlarged cam bosses allow machining for larger cam bearings
  • 2.000" O.D. (1.867" I.D.) cam bearings P/N 12370843 required
  • Blocks may require clearancing at top of lifter bores (0.842") for some roller lifters
  • Timing system clearance should be checked before engine assembly
  • Extra-thick main bearing bulkhead machined at 5°
  • Premium main studs and steel main bearing caps
  • Priority main oiling system
  • Billet wet sump rear main cap can be converted to dry sump with plugs
  • Oil dipstick holes not drilled
  • Comes with dowel pins