MANLEY PLATINUM SERIES Lightweight Pistons, -20cc Dish [Bore Size 4.165 | Stroke 4.250 | Compression Distance 1.315 | Pin Diameter .927 | 64cc 10.9 | 66cc 10.7 | 70cc 10.3 | 72cc 10.1 | 78cc 9.6 | Piston Wt/Gms 494 | Piston & Pin Wt/Gms 612] (Warhawk & RHS LS) : COLORADOSPEED - LATE MODEL DOMESTIC (AMERICAN MUSCLE) | IMPORT (EUROPEAN | SPORT COMPACT) AUTOMOTIVE PERFORMANCE PARTS