Product Description


This item is for eight (8) .030 over bore Speed Pro hypereutectic, 33cc dome top, coated skirt pistons and cast piston ring set (Hastings/MAHLE) for Chevrolet 454ci (7.4L) big block V-8 engines. P/N (8) H581CP-030 + 683-030. These pistons can be used as a performance upgrade in most 454ci engines.



Bore: 4.280 in. (at .030 bore)
Stroke: 4.000 in. (stock)
Connecting Rod Length: 6.135 in.; rods NOT included
Piston Material: Hypereutectic aluminum
Piston Top Style: Dome with 2-valve reliefs
Dome Height: .340 in.
Dome Volume: -33cc
Compression Height: 1.640 in.
Wrist Pin Diameter: .990 in.; pins included
Wrist Pin Style: Press-fit or floating; pin clips included
Ring Land Thickness: 5/64-5/64-3/16 (oil ring); rings included
Usage: Street and mild strip; up to 150HP nitrous
RPM Range: Idle-6,500
Compression Ratio (approximate): 12.2:1 w/100.9cc; 11.4:1 w/106.9cc; 11.1:1 w/109.4cc; 10.2:1 w/119cc


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