Speed Pro Speed Pro Piston Forged 4.390" Bore 5/64 x 5/64 x 3/16" Ring Grooves - Minus 22.0 cc Heat Barrier 500 " Bore CenterSince 1989

500 " Bore CenterSince 1989

Available separately

Foam / Fiber Filter

Includes front duckbill to enhance aerodynamic performance

Sold as a kit (6pcs)

Speed Pro Speed Pro Piston Forged 4.390" Bore 5/64 x 5/64 x 3/16" Ring Grooves - Minus 22.0 cc Heat Barrier 500 " Bore CenterSince 1989Fully 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.