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7] Crane’s 1449381 camshaft has the same lift as 1449371, but duration at 0.050 is 220/236 (intake/exhaust). It pushes peak HP into a slightly higher rpm range, while maintaining the same torque band. It requires some mild modifications, like additional fuel and exhaust, as well as a different converter for automatics. It picked up 19.9 horsepower and 3 lb-ft over the first Crane cam we tested. Peak hp was now 520 at 6,400.