Speed Pro Speed Pro Piston Forged 4.124" Bore 5/64 x 5/64 x 3/16" Ring Grooves - Plus 38.3 cc RG200012XL Same convenient port locations for

Same convenient port locations for easy plumbing

Be sure to check out all our products from Holley Performance including Holley Intake Manifolds

often used in commercial and military aircraft

330 Diameter

5% Para Aramid

Speed Pro Speed Pro Piston Forged 4.124" Bore 5/64 x 5/64 x 3/16" Ring Grooves - Plus 38.3 cc RG200012XL Same convenient port locations forFully 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.