Product Description


This item is for eight (8) .040 over bore Speed Pro (Sealed Power) hypereutectic flat top pistons and a cast piston ring set for Chevrolet 454ci (7.4L) big block V-8 engines. P/N (8) H661CP-040 + 683-040. These pistons can be used as a performance upgrade in engine originally equipped with dish pistons. Other modifications may be needed in computer controlled engines.

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: 4.290 in. (at .040 bore)
  • Stroke: 4.000 in. (stock)
  • Connecting Rod Length: 6.135 in. (stock); rods NOT included
  • Piston Top Style: Flat top with 2-valve reliefs
  • Piston Head Volume: +2.00cc
  • Compression Height: 1.625 in.
  • Piston Material: Hypereutectic aluminum
  • Wrist Pin Diameter: .989 in.; pins included
  • Wrist Pin Style: Press-fit only
  • Ring Land Sizes: 5/64-5/64-3/16 (oil ring); rings included
  • Notes: DurOshield coated skirts
  • Usage: Street and mild strip; up to 75HP nitrous
  • RPM Range: Idle - 6,000
  • Compression Ratio (approximate): 8.9:1 w/100.9cc; 8.4:1 w/109.4cc; 7.9:1 w/119cc

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