Manley Platinum Series Lightweight Pistons, 18cc Spherical Dish [Bore Size 3.552 | Rod Length 5.933 | Stroke 3.543 | Compression Distance 1.220 | 42cc 9.54 | 51cc 8.53 | 52cc 8.44 | Piston Wt/Gms 384 | Piston & Pin Wt/Gms 472] (FORD 4.6L & 5.4L) : COLORADOSPEED - LATE MODEL DOMESTIC (AMERICAN MUSCLE) | IMPORT (EUROPEAN | SPORT COMPACT) AUTOMOTIVE PERFORMANCE PARTS