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Useless, I used rubber stoppers from the local hardware store. They come in different sizes and you just put them in the hose and put the hoses back on. They block off the flow and are easy to take back off. Cheap too, about $.35 cents each. Work great and everything looks stock.

65Valiant310. All my research on radiator caps tells me higher pressure does not help run cooler. It just raises the boiling point approx 3 deg. per pound. i.e. 10 lb cap = 30 deg. rise = 212+30 = approx 242 deg. to boil. My 51 Nash street rod never has run hot and I have a 4 lb. cap. My 65...

This might sound elementry, but if your lower radiator hose does not have the coiled wire inside, it will colapse at freeway rpm and restrict the coolant flow. Around town no problem.