Thanks guys , I do have an electric fan mounted on a full shroud sealed to the back side of the radiator and am running a 160 full flow thermostat. It seems to do ok if I let it purge out and don't top off the radiator again . It's just hard for me to get over the "Top Off the Fluids" thinking and fill it up again . Also , if I put an overflow catch can on the radiator will that require a different cap inorder to let the coolant back in to the radiator ?