MANLEY PLATINUM SERIES Lightweight Pistons, -31cc Dish [Bore Size 4.185 | Stroke 4.250 | Compression Distance 1.315 | Pin Diameter .927 | 64cc 10.0 | 66cc 9.8 | 70cc 9.5 | 72cc 9.3 | 78cc 8.9 | Piston Wt/Gms 501 | Piston & Pin Wt/Gms 619] (Warhawk & RHS LS) : COLORADOSPEED - LATE MODEL DOMESTIC (AMERICAN MUSCLE) | IMPORT (EUROPEAN | SPORT COMPACT) AUTOMOTIVE PERFORMANCE PARTS