Speed Pro Speed Pro Piston Forged 4.000" Bore 5/64 x 5/64 x 3/16" Ring Grooves - Minus 6.1 cc PD155K Available in a set of

Available in a set of 12 under 831-12The COMP Cams philosophy has never changed: make the highest performing products possible and lead the industry in technological development

**Used on the following pumps

hose it down and carry on

Goes on vent fitting on fuel cell

000 in Oval Port

Speed Pro Speed Pro Piston Forged 4.000" Bore 5/64 x 5/64 x 3/16" Ring Grooves - Minus 6.1 cc PD155K Available in a set ofFully 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.