Speed Pro Speed Pro Piston Forged 4.060" Bore 5/64 x 5/64 x 3/16" Ring Grooves - Minus 6.1 cc Jet Performance Products High Pressure spring (included) supports

High Pressure spring (included) supports 75-120 PSI base fuel pressure

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Speed Pro Speed Pro Piston Forged 4.060" Bore 5/64 x 5/64 x 3/16" Ring Grooves - Minus 6.1 cc Jet Performance Products High Pressure spring (included) supportsFully updated skirt profiles Exclusive DUROSHIELD skirt coating. DUROSHIELD provides scuff resistance, reduced bore clearances and enhanced ring sealing. SPEED PRO POWERFORGED pistons are built to stringent specifications with a precision CNC machined dome and skirts and microfinished ring grooves. The manufacturing process ensures that piston weights within a boxed set will not vary more than 4 grams and that skirt sizes are matched to within 0.