Manley Platinum Series Lightweight Pistons, 18cc Spherical Dish [Bore Size 3.700 | Rod Length 5.933 | Stroke 3.543 | Compression Distance 1.220 | 42cc 10.21 | 51cc 9.13 | 52cc 9.03 | Piston Wt/Gms 431 | Piston & Pin Wt/Gms 519] (FORD 4.6L & 5.4L) : COLORADOSPEED - LATE MODEL DOMESTIC (AMERICAN MUSCLE) | IMPORT (EUROPEAN | SPORT COMPACT) AUTOMOTIVE PERFORMANCE PARTS