I grind cranks down from the big, retarded Chrysler Rod throws to BBC (2.375 to 2.200) and small block Chrysler stuff down to SBC SJ (2.125 to 2.000) and never ever found an issue with hardness.
Ken from Oregon Cams said it's all bullshit about grinding hardness off on Chrysler cams and cranks. He told me Chrysler hardened their cams and cranks almost to the core.
