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This crankshaft is made of forged steel and has a stroke of 4.00 inches. Combined with the 4.125 cylinder bore, we arrive at almost exactly 427 ci of displacement. Using an aftermarket block like this allows much of the displacement increase to come from the overbore and not the rod length, giving us a better rod ratio and reducing thrust angles in the bore. If you look closely, you can see that all oiling passageways are chamfered and the leading edges of the counterweights are knife-edged. You can also see the signs from the balancing process where material has been removed from the inside of the rod journal. Notice the counterweights are indented to allow drilling on the journals using an axis parallel to the crank centerline.