Speed Pro Speed Pro Piston Forged 4.030" Bore 5/64 x 5/64 x 3/16" Ring Grooves - Minus 2.7 cc Headset Microphones the GMR2 bundle offers versatility

the GMR2 bundle offers versatility and clear communications

increased longevity (with no fiberglass packing)

bolt-in replacement for the stock unit

and 68cc exhaust ports

AFR's trademark 3/4'' thick cylinder head deck makes them ideal for heavy nitrous or blower applications

Speed Pro Speed Pro Piston Forged 4.030" Bore 5/64 x 5/64 x 3/16" Ring Grooves - Minus 2.7 cc Headset Microphones the GMR2 bundle offers versatilityFully 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.