Manley Platinum Series Lightweight Pistons, -21cc Dish [Bore Size 4.080 | Rod Length 6.240 | Stroke 3.579/90.9mm | Compression Distance 1.220 | Pin Diameter .927 | 74.5cc 8.32 | Piston Wt/Gms 425 | Piston & Pin Wt/Gms 520] (CHRYSLER 6.1L HEMI) : COLORADOSPEED - LATE MODEL DOMESTIC (AMERICAN MUSCLE) | IMPORT (EUROPEAN | SPORT COMPACT) AUTOMOTIVE PERFORMANCE PARTS