If you're looking for pistons with an unbeatable combination of performance and value, then Speed-Pro hypereutectic pistons are for you. These pistons are manufactured from FM244 aluminum alloy, which contains 16 percent silicon for greater strength and wear resistance. They're also molded in the latest permanent-mold technology to ensure the precise fit and tight bore clearances that today's top engine builders demand. They're ideal for use in high performance street, bracket racing, and oval track racing and will work perfectly with normal ring end gaps. Ford 289 302 (1963-2001) Hypereutectic Piston - Flat Top Four Valve Relief Piston. Bore (in): 4.000 in Bore (mm): 101.600mm Piston Style: Flat top, with four valve reliefs Piston Material: Hypereutectic aluminum Wrist Pin Style: Press-fit or floating Pin Diameter (in): 0.912 in. Piston Ring Thickness: 5/64 in. x 5/64 in. x 3/16 in.
