Speed Pro Speed Pro Piston Forged 4.280" Bore 5/64 x 5/64 x 3/16" Ring Grooves - Plus 25.7 cc R03J015XXL Allstar Performance 2-5/8" mechanical gauges

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

First introduced in January 2009

Proven in NHRA competition by Warren Johnson

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

Speed Pro Speed Pro Piston Forged 4.280" Bore 5/64 x 5/64 x 3/16" Ring Grooves - Plus 25.7 cc R03J015XXL Allstar Performance 2-5/8" mechanical gaugesFully 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.