This item is for eight (8) .020 over bore Speed Pro/Sealed Power hypereutectic, coated skirt flat top pistons and a moly piston ring set (Hastings/MAHLE) for Ford 289ci and 302ci small block V-8 engines. P/N (8) H273CP-020 + 2M139-020. These pistons can be used as a performance upgrade in engines originally equipped with dish top pistons.

PISTON SPECIFICATIONS

• Bore 4.020 in. (at .020 bore)
• Stroke: 2.870 in. for 289ci; 3.000 in for 302 (stock)
• Connecting Rod Length: 5.155 in for 289ci, 5.090 in. for 302ci; rods NOT included
• Piston Top Style: Flat top with 4-valve reliefs
• Piston Head Volume: +8.0cc
• Compression Distance: 1.605 in.
• Wrist Pin Diameter: .912 in.; pins included
• Wrist Pin Style: Press-fit or floating; pin clips included
• Ring Land Size: 5/64-5/64-3/16 (oil ring); rings included
• Usage: Street and mild strip; up to 75HP of nitrous
• RPM Range: Idle - 6,000
• Compression Ratio (approximate): 9.2:1 w/58cc; 8.9:1 w/60cc; 8.1:1 w/68cc