Changing the radiator on a thermostat equipped motor would not decrease warm-up time since that is controlled by the thermostat. The water pump tries to move the same amount of water at a specific RPM no mattter what the size of the radiator and quite possibly a larger radiator would have less flow resistance and reduce the load on the pump. If you want to reduce the load on the pump then look into an underdrive pulley set which would slow both your water pump and alternator and reduce the load of both.
Christ: Why do you run no stat?
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