SPEED PRO Forged 30cc Dome Pistons/8+CAST Rings for Chevy BB 454 LS6 11.0:1 .030

This item is for eight (8) .030 over bore Speed Pro (Sealed Power) powerforged 30cc dome pistons and a cast piston ring set (Hastings/MAHLE) for Chevrolet 454ci (7.4L) big block V-8 engines. P/N (8) L2349F-030 + 683-030. These pistons are Speed Pro's version of the 1970 454 LS6 pistons.

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

PISTON SPECIFICATIONS

• Bore: 4.280 in. (at .030 bore)
• Stroke: 4.000 in. (stock)
• Connecting Rod Length: 6.135 in. (stock); rods NOT included
• Piston Material: Forged aluminum
• Piston Top Style: Dome with single valve reliefs
• Dome Height: .265 in.
• Dome Volume: -30.60cc
• Compression Height: 1.645 in.
• Wrist Pin Diameter: .989 in.; pins included
• Wrist Pin Type: Press-fit only
• Ring Land Size: 5/64-5/64-3/16 (oil ring); rings included
• Notes: 1970 454 LS6; closed chamber heads; DurOshield coated skirts
• Usage: Street and milt strip; up to 150HP nitrous
• RPM Range: Idle - 7,000
• Compression Ratio (approximate): 12.2:1 w/100.9cc; 11.2:1 w/109.4cc; 10.2:1 w/119cc