Speed Pro Speed Pro Piston Forged 4.080" Bore 5/64 x 3/32 x 3/16" Ring Grooves - Minus 10.0 cc Helmet Side Plate GM A-Body 1964-72 / F-Body

GM A-Body 1964-72 / F-Body 1967-69 / X-Body 1968-74

Sierra 1500 HD 2003-2001

10 psi higher pressure over the M365

6 AN Straight Female to 6 AN Straight Female

Doubles As A Jam Nut

Speed Pro Speed Pro Piston Forged 4.080" Bore 5/64 x 3/32 x 3/16" Ring Grooves - Minus 10.0 cc Helmet Side Plate GM A-Body 1964-72 / F-BodyFully 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.