Cryogenic treatment

Cyro treating helps stabilize the molecular formations in the iron. Cast cranks have less of the right type of structures to be affected as much. It will still help, but IMO it's useless, and the crank will distort and need to be re-machined. Those cranks will easilly take 550hp and they wear decently. If you want a better crank, upgrade to a forged. It's not worth strengthening a mid grade part when there's better/stronger available for a few more $$