Product Description


This item is for eight (8) .040 bore Speed Pro (Sealed Power) hypereutectic flat top with 4-valve relief pistons and a moly piston ring set (Hastings/MAHLE) for Ford 351ci (5.8L) Windsor small block V-8 engines. P/N (8) H336CP-040 + 2M139-040. These pistons are for use with 9.503-in. deck height blocks; approximately 1971 and later. Before ordering, verify these pistons will work with your set-up.

These pistons can be used as a performance upgrade in engines originally equipped with dish top pistons.

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: 4.040 in. (at .040 bore)
  • Stroke: 3.500 in. (stock)
  • Connecting Rod Length: 5.956 in. (stock); rods NOT included
  • Piston Top Style: Flat top with 4-valve reliefs
  • Piston Head Volume: +12.00cc
  • Compression Height: 1.772 in.
  • Piston Material: Hypereutectic aluminum
  • Wrist Pin Diameter: .912 in.; pins included
  • Wrist Pin Style: Press-fit or floating; pin clips included
  • 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): 9.5:1 w/60.4cc; 9.2:1 w/63cc; 8.7:1 w/69cc

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