Speed Pro Speed Pro Piston Forged 4.280" Bore 5/64 x 5/64 x 3/16" Ring Grooves - Plus 29.4 cc AK113112S Because E85 fuel can vary

Because E85 fuel can vary in the amount of ethanol and gasoline mixture

Header back system

8100 Eco-nergy

Another unique feature of the Pro Mag 12 is a built-in Soft Touch Rev Control

Fits Quadrajet

Speed Pro Speed Pro Piston Forged 4.280" Bore 5/64 x 5/64 x 3/16" Ring Grooves - Plus 29.4 cc AK113112S Because E85 fuel can varyFully 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 micro finished 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.