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I have a 1930 Ford 5-window coupe with a 351C. I have an alluminum radiator with electric fan. I tried 160-195 thermostats and nothing would keep it cool.After installing the restrictor with a 160 therm. its stays around 180 on the road and gets cooler when driving in town. Only time it as reached 210 was on 100+ days. Thought that one worked so well I put one in my 70 cougar conv. Before I installed it I would run it in some parades and it would over heat every time. After installing it running a 160 thermostat it stayed below the half way mark on the guage. It is a must have for overheating problems on the 351c.
I can't offer hard facts to say this works better than an original brass restrictor and the special 351C stat, but I can say this with a standard type stat works great. Did around 75 miles today, a 90 degree day, and at times up around 75 MPH and gauge never went past about 60% of the C-H range. Best temps I have ever had with this 72 XR7.