Speed Pro Speed Pro Piston Forged 4.390" Bore 5/64 x 5/64 x 3/16" Ring Grooves - Minus 22.0 cc RK-R1 Manley Sportmaster connecting rods are

Manley Sportmaster connecting rods are forged from aircraft quality 4340 steel

Short Throw Ratchet Action Reduces Shift Time

Snell M2020 approved and DOT rated

Adds a dramatic amount of performance and durability to any vehicle

Includes a high flow billet aluminum and back anodized Lightning 45 bottle valve

Speed Pro Speed Pro Piston Forged 4.390" Bore 5/64 x 5/64 x 3/16" Ring Grooves - Minus 22.0 cc RK-R1 Manley Sportmaster connecting rods areFully 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.