Product Description


This item is for eight (8) .030-in. over bore Speed Pro (Sealed Power) hypereutectic flat top with 4-valve relief pistons for Chevrolet 400ci small block V-8 engines using 5.565-in. length connecting rods (stock length). P/N (8) H400CP-030.

If you're looking for pistons with an unbeatable combination of performance and value, then Speed-Pro hypereutectic pistons are for you. These pistons are manufactured from aluminum alloy that contains 16 percent silicon for greater strength and wear resistance. They're also molded in the latest permanent-mold technology to ensure the precise fit and tight bore clearances that today's top engine builders demand. Hypereutectic pistons are ideal for use in high performance street, bracket, and oval track racing—and will work perfectly with normal ring end gaps.


  • Bore: 4.155 in. (at .030 bore)
  • Stroke: 3.750 in. (stock)
  • Connecting Rod Length: 5.565 in. (stock); rods NOT included
  • Piston Top Style: Flat top with 4-valve reliefs
  • Piston Head Volume: +6.00cc
  • Compression Height: 1.560 in.
  • Piston Material: Hypereutectic aluminum
  • Wrist Pin Diameter: .928 in.; pins included
  • Wrist Pin Style: Press-fit only
  • Ring Land Sizes: 5/64-5/64-3/16 (oil ring); rings not included
  • Notes: DurOshield coated skirts
  • Usage: Street and mild strip; up to 75HP nitrous
  • RPM Range: Idle - 6,000
  • Compression Ratio (approximate): 11.58:1 w/58cc; 10.83:1 w/64cc; 9.61:1 w/76cc

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