MANLEY PLATINUM SERIES Lightweight Pistons, -20cc Dish [Bore Size 4.185 | Stroke 4.250 | Compression Distance 1.315 | Pin Diameter .927 | 64cc 11.0 | 66cc 10.8 | 70cc 10.4 | 72cc 10.2 | 78cc 9.7 | Piston Wt/Gms 502 | Piston & Pin Wt/Gms 620] (Warhawk & RHS LS) : COLORADOSPEED - LATE MODEL DOMESTIC (AMERICAN MUSCLE) | IMPORT (EUROPEAN | SPORT COMPACT) AUTOMOTIVE PERFORMANCE PARTS