Hi Mike, I bought the pressure release valve and had a set of pumps rebuilt at the same time. I put the pressure valve on first and solved the water loss/over heating problem. Then a few months later I had to replace the timing gear and during that repair I put the rebuilt pumps on. The pumps gave me ~ 20* reduction in engine operating temperature. I can run all day in 90-100* temps without over heating. The hottest my engine has gotten since adding valve and pumps has been 190* and that was at the '10 Charlotte Meet while the car was idling in front of the host hotel for 30-40 minutes. The outside temp. that day was ~ 100*. I'm not trying to be a salesman for Skip, but I'm sure a believer in those two products he sells.