MANLEY PLATINUM SERIES Lightweight Pistons, -29cc Dish [Bore Size 4.185 | Rod Length 6.460 | Stroke 4.250 | Compression Distance 1.115 | Pin Diameter .927 | 64cc 10.1 | 66cc 10.0 | 70cc 9.6 | 72cc 9.5 | 78cc 9.1 | Piston Wt/Gms 463 | Piston & Pin Wt/Gms 581] (GM LS) : COLORADOSPEED - LATE MODEL DOMESTIC (AMERICAN MUSCLE) | IMPORT (EUROPEAN | SPORT COMPACT) AUTOMOTIVE PERFORMANCE PARTS