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Musi selected a Scat 4.250-inch stroke crankshaft, made of cast steel, for this engine. The steel material makes it a tough unit capable of withstanding abuse-especially from nitrous. It is one of the reasons Edelbrock offers a two-year warranty with unlimited mileage. We're already familiar with the Scat 9000 cast-steel crank, as we've been abusing this very same crank in our '68 Chevelle's 496 big-block.