Speed Pro Speed Pro Piston Forged 4.165" Bore 5/64 x 5/64 x 3/16" Ring Grooves - Minus 18.0 cc M59S1 O-ring seals can be added

O-ring seals can be added to modified blocks to improve oil pressure controlSpecial oil tract improves lubrication to the distributor and cam gearNylon pads ensure smooth operation of the advance weights┬ ¼Î“ÇáPowerful built-in module produces a 7

1952-1954 Mercury Custom

1923-1949 STREET ROD CID 327

1963-1966 Dodge Wm300 Power Wagon

Tube and Fin

Speed Pro Speed Pro Piston Forged 4.165" Bore 5/64 x 5/64 x 3/16" Ring Grooves - Minus 18.0 cc M59S1 O-ring seals can be addedFully 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.