MANLEY PLATINUM SERIES Lightweight Pistons, -31cc Dish [Bore Size 4.125 | Stroke 4.250 | Compression Distance 1.315 | Pin Diameter .927 | 64cc 9.7 | 66cc 9.6 | 70cc 9.2 | 72cc 9.1 | 78cc 8.7 | Piston Wt/Gms 482 | Piston & Pin Wt/Gms 600] (Warhawk & RHS LS) : COLORADOSPEED - LATE MODEL DOMESTIC (AMERICAN MUSCLE) | IMPORT (EUROPEAN | SPORT COMPACT) AUTOMOTIVE PERFORMANCE PARTS