Speed Pro Speed Pro Piston Forged 4.160" Bore 5/64 x 5/64 x 3/16" Ring Grooves - Minus 6.7 cc 120005 Cup will accept a 1”

Cup will accept a 1” or 1-1/8” weight jack bolt

DMI XR-1 Rear Ends

1986-1987 Mercury Topaz

Splined Bearing Shoulder

no need for extra lines to the tank

Speed Pro Speed Pro Piston Forged 4.160" Bore 5/64 x 5/64 x 3/16" Ring Grooves - Minus 6.7 cc 120005 Cup will accept a 1”Fully 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.