Manley Platinum Series Lightweight Pistons, 18cc Spherical Dish [Bore Size 3.572 | Rod Length 5.933 | Stroke 3.543 | Compression Distance 1.220 | 42cc 9.63 | 51cc 8.62 | 52cc 8.52 | Piston Wt/Gms 390 | Piston & Pin Wt/Gms 478] (FORD 4.6L & 5.4L) : COLORADOSPEED - LATE MODEL DOMESTIC (AMERICAN MUSCLE) | IMPORT (EUROPEAN | SPORT COMPACT) AUTOMOTIVE PERFORMANCE PARTS