Speed Pro Speed Pro Piston Forged 4.090" Bore 5/64 x 3/32 x 3/16" Ring Grooves - Minus 10.0 cc NMO-MT-15 Adjustable centerlink inserts have tapered

Adjustable centerlink inserts have tapered or straight-through designs

New needle and seat nuts and screws

Double layer Nomex

Packed with legendary MSD Ignition power

Flow Through Top

Speed Pro Speed Pro Piston Forged 4.090" Bore 5/64 x 3/32 x 3/16" Ring Grooves - Minus 10.0 cc NMO-MT-15 Adjustable centerlink inserts have taperedFully 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.