Speed Pro Speed Pro Piston Forged 4.000" Bore 5/64 x 5/64 x 3/16" Ring Grooves - Minus 6.1 cc Falcon Transmission Brawlers come with the latest

Brawlers come with the latest technology in air/fuel calibrations for today’s street or race engine demands

The 12-600 features improved hot fuel handling capabilities and was designed to greatly reduce the negative effects of heated fuel now common with many of today's pump gas blends

absolute barometric pressure

A minimum 20-40 degree temperature reduction over copper/brass/lead radiators make these ideal for big inch

No collector gasket is needed

Speed Pro Speed Pro Piston Forged 4.000" Bore 5/64 x 5/64 x 3/16" Ring Grooves - Minus 6.1 cc Falcon Transmission Brawlers come with the latestFully 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.