Hi CaptnK,
The pistons for powertorques are the same for the full crank. They are the same piston. They are backward compatible, i.e. the latest model powertorque piston will fit directly into a full crank, but an original full crank piston wont fit in a powertorque because the ring end has a propensity to foul on the transfer ports due to the location of the ring dowels.
Regards, Ted
