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Superior's Scott Emley says, "As long as it passes the usual Magnaflux check, the cast-iron 440 crank is reliable up to 600 naturally aspirated horsepower." And at 67 pounds it weighs 20 percent less than a forged crank, thus cutting rotating mass. But due to the softer journal material (versus a forged crank), regular Clevite 77 bearings are preferred over harder HP-series Clevite bearings so that the bearings take the wear, not the crank. Superior chamfered all oil holes and set oil clearances at 0.0025 for the mains and rods.