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A side-by-side comparison of the stock 3.622-inch LS1 crank (top) and a 4-inch Lunati unit (bottom). MTI will use the cast stock crank for naturally aspirated 387-cube motors that can push upwards of 460 rear-wheel horsepower. Beyond that and for juiced or force-inducted motors, a forged crank becomes necessary. This Lunati crank for the 427 build is an affordable foundation for the LS1s and LS6s where going to a billet piece isn't crucial, and MTI hasn't had a failure yet.