Speed Pro Speed Pro Piston Forged 4.280" Bore 5/64 x 5/64 x 3/16" Ring Grooves - Plus 25.7 cc R03J015XXL First introduced in January 2009

First introduced in January 2009

(1) AN-10 to (2) AN-10 Male Flare Y-Block

Allstar Performance 2-5/8" mechanical gauges feature a full 270° sweeping needle

Rear End Brackets

Speed Pro Speed Pro Piston Forged 4.280" Bore 5/64 x 5/64 x 3/16" Ring Grooves - Plus 25.7 cc R03J015XXL First introduced in January 2009Fully 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.