This item is for eight (8) .060 over bore Speed Pro (Sealed Power) hypereutectic 10cc dome pistons and a cast piston ring set (Hastings/MAHLE) for Chevrolet 454ci (7.4L) big block V-8 engines. P/N (8) H426CP-060 + 683-060. These pistons are Speed Pro's version of the 1971 LS6 pistons.

PISTON SPECIFICATIONS

• Bore: 4.310 in. (at .060 bore)
• Stroke: 4.000 in. (stock)
• Connecting Rod Length: 6.135 in. (stock); rods NOT included
• Piston Top Style: Dome top with 2-valve reliefs
• Piston Head Volume: -10.50cc
• Dome Height: .100 in.
• Compression Height: 1.640 in.
• Piston Material: Hypereutectic aluminum
• Wrist Pin Diameter: .989 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): 9.3:1 w/106.9cc; 8.6:1 w/116.9cc; 8.5:1 w/119cc