Speed Pro Speed Pro Piston Forged 4.350" Bore 5/64 x 5/64 x 3/16" Ring Grooves - Minus 7.0 cc RG20001XS Dana 60 / 61

Dana 60 / 61

NOTE: The 20-121 is not designed for use with some early model Holley carbs

400 in Stroke

Stores 100 Chassis Setups

producing approximately 3

Speed Pro Speed Pro Piston Forged 4.350" Bore 5/64 x 5/64 x 3/16" Ring Grooves - Minus 7.0 cc RG20001XS Dana 60 / 61Fully 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.