Manley Platinum Series Lightweight Pistons, 18cc Spherical Dish [Bore Size 3.700 | Rod Length 5.850 | Stroke 3.750 | Compression Distance 1.200 | 42cc 10.75 | 51cc 9.61 | 52cc 9.50 | Piston Wt/Gms 421 | Piston & Pin Wt/Gms 509] (FORD 4.6L & 5.4L) : COLORADOSPEED - LATE MODEL DOMESTIC (AMERICAN MUSCLE) | IMPORT (EUROPEAN | SPORT COMPACT) AUTOMOTIVE PERFORMANCE PARTS