I cryoed a 727 output shaft before Rick Allison sold me an aftermarket one. My metallurgist said I wasted my money because of the material. I forget what the material is but once I told her she said cryo has no effect on that material type.

67 Coronet 500 9.610 @ 139.20 mph
67 Coronet 500 (street car) 14.82 @ 94 mph
69 GTX (clone) - build in progress......