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Did it seem to make a difference?



I just think by having some type of restrictor in there slows the flow enough to allow the water flowing thru the radiator to cool a bit longer.



May seem that way but that is not the case with a closed loop system. The only benefit of using a restrictor is to keep heat in the motor. You might ask yourself what a thermostat does? It opens as the coolant gets warmer thus allowing more flow. When the coolant is at it hottest temp the thermostat is wide open. So...how can using a restrictor-which impedes flow actually make your cooling system more efficient? Answer? It doesn't but there are some who will continue to hang onto this myth.