MANLEY PLATINUM SERIES Lightweight Pistons, -18cc Dish [Bore Size 4.185 | Rod Length 6.460 | Stroke 4.250 | Compression Distance 1.115 | Pin Diameter .927 | 64cc 11.2 | 66cc 11.0 | 70cc 10.6 | 72cc 10.4 | 78cc 9.9 | Piston Wt/Gms 468 | Piston & Pin Wt/Gms 586] (GM LS) : COLORADOSPEED - LATE MODEL DOMESTIC (AMERICAN MUSCLE) | IMPORT (EUROPEAN | SPORT COMPACT) AUTOMOTIVE PERFORMANCE PARTS