Speed Pro Speed Pro Piston Forged 4.150" Bore 5/64 x 5/64 x 3/16" Ring Grooves - Minus 6.7 cc 11548 Designed to fit all 1958-86

Designed to fit all 1958-86 Small Block Chevy engines with perimeter bolt patterns

Fits 1/2-20

A full High Pressure bottle can typically last 2-3 race days or track days of tire work depending on the application

1982-1987 GMC Caballero

enabling chassis adjustments on street stock and other race cars that are not allowed to use weight jack bolts or threaded adjusters

Speed Pro Speed Pro Piston Forged 4.150" Bore 5/64 x 5/64 x 3/16" Ring Grooves - Minus 6.7 cc 11548 Designed to fit all 1958-86Fully 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.