J MARTIN AUTO bundled set of (8) hypereutectic Flat top with 4-valve relief pistons and a moly piston ring set compatible with 1968-86 Ford 289 cid and 302 cid small block V-8 engines. Doe not include 302 BOSS engines. These pistons can be used in place of engines originally equipped with dish top pistons. Stroke: 2.870-in. 289, 3.000-in. 302; Stock Connecting Rod Length: 5.155-in. 289, 5.090-in. 302; rods NOT included Piston Top Style: Flat Top with 4-valve reliefs Piston Head Volume: +3.00cc Compression Height: 1.585 in. Piston Material: Hypereutectic aluminum Wrist Pin Diameter: .912 in.; pins included Wrist Pin Style: Press-fit only Ring Land Sizes: 5/64-5/64-3/16 (oil ring); rings included RPM Range: Idle - 6,000 Compression Ratio (approximate): 10.17:1 w/54.5cc; 9.44:1 w/60.4cc; 8.57:1 w/69.0cc