MANLEY PRO SERIES 4340 Forged Steel Crankshaft [Stroke 4.000 | Minimum Rod Length 6.125 | Main Journal Diameter 2.559 | Bobweight (grams) 1820 | Total Weight (lbs.) 51-53] (GM LT1 & LT4) : COLORADOSPEED - LATE MODEL DOMESTIC (AMERICAN MUSCLE) | IMPORT (EUROPEAN | SPORT COMPACT) AUTOMOTIVE PERFORMANCE PARTS