Product Description


This item is for eight (8) .030 over bore Speed Pro hypereutectic dish top pistons and a moly piston ring set (Hastings/MAHLE) for Chevrolet 350ci small block V-8 engines using a "Stroker" 3.750-in. stroke crankshaft. P/N (8) H859CP-030 + 2M139-030. This combination is commonly referred to as a "383."

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: 4.030in. (at .030 bore)
  • Stroke: 3.750 in.
  • Connecting Rod Length: 5.700 in.; rods NOT included
  • Piston Top Style: Dish with 2-valve reliefs
  • Piston Head Volume: +12cc
  • Compression Height: 1.425 in.
  • Wrist Pin Diameter: .927 in.; pins included
  • Wrist Pin Style: Floating or press-fit; pin clips included
  • Ring Land Size: 5/64-5/64-3/16 (oil ring); rings included
  • Notes: Coated skirts
  • Usage: Street and mild strip; up to 75HP nitrous
  • RPM Range: Idle - 6,000
  • Compress Ratio (approximate): 10.4:1 w/58cc; 9.7:1 w/64cc; 8.7:1 w/76cc


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