MANLEY PLATINUM SERIES Standard Pistons, -4cc FLAT TOP [Bore Size 3.910 | Rod Length 6.125 | Stroke 3.622 | Comp Distance 1.313 | Pin Diam .927 | Piston Wt/Gms 427 | Valve Pocket Depth Int./Exh. .175/.150] (GM LS1, LS6 & LS2) : COLORADOSPEED - LATE MODEL DOMESTIC (AMERICAN MUSCLE) | IMPORT (EUROPEAN | SPORT COMPACT) AUTOMOTIVE PERFORMANCE PARTS