The 4G63 range of crankshafts are only manufactured in the EN40B material. As proven by our RB30 range of En40B crankshafts, the EN40B is an outstanding material capable of withstanding the harshest of applications. A multitude of 4G63 builds feature our EN40B crankshafts with significant success on both the drag strip and the circuit. To take your 4G63 build to the next level, the EN40B crank is a must for any build.
