SPEED-PRO Cast Hypereutectic Pistons, Flat Dish [Comp Dist 1.328 | Head Type Flat;DUROSHIELD~skirt coated | Dome Vol CC 0.0 | Min Clearance .0015 | Pin Type P | Pin Wgt Gram 151 | Weight w/o Pin 451 gm | Pin Diameter 0.945 in | Pin Offset 0.762 mm | Bore 3.917 in | Lock Ring N/R] (GM LS1 & LS6) : COLORADOSPEED - LATE MODEL DOMESTIC (AMERICAN MUSCLE) | IMPORT (EUROPEAN | SPORT COMPACT) AUTOMOTIVE PERFORMANCE PARTS