Product Description


This item is for eight (8) .030-in. over bore Speed Pro (Sealed Power) forged coated skirt pistons for Oldsmobile 455ci V-8 engines. P/N (8) L2323F-030. These pistons are Speed Pro's version of the GM 4-barrel pistons used in these engines.

Speed Pro forged pistons are made from extruded VMS-75 aluminum alloy that is forged under 3,000 tons of pressure to "near-net" shape. After that, they are machined to their final configuration. These pistons offer excellent strength and durability and are capable of taking the punishment that is dished out on the street and in competition.


  • Bore: 4.155 in. (at .030 bore)
  • Stroke: 4.250 in. (stock)
  • Connecting Rod Length: 6.735 in. (stock); rods NOT included
  • Piston Top Style: Dish top with no valve reliefs
  • Piston Top Shape: .142 in. deep dish
  • Piston Head Volume: +18.0cc
  • Compression Height: 1.735 in.
  • Piston Material: Forged aluminum
  • Wrist Pin Diameter: .980 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 150HP nitrous
  • RPM Range: Idle - 6,500
  • Compression Ratio (approximate): 10.65:1 w/64cc; 9.93:1 w/72cc; 9.3:1 w/80cc

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