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I recently purchased a 1967 F100 with a 352. It runs well, but if I drive it for, say, 10 miles, then go into a store and come out in 20 minutes, the temp has gone up to 3/4 to Hot, it's hard to start, and runs like crud. After 1/4 mile or so, the temp comes down to just past the 1/2 way mark. The radiator is good, as is the water pump and thermostat. The timing and gap on the plugs are good. Since I live in Arizona this is an issue as its still over 100^ all afternoon.
I am wondering if anyone has any suggestions or if anyone has converted to electric cooling with a thermostat so the engine is still being cooled after you shut it off. Sincere thanks, Car1
Does your engine have an alum 4brl. intake? That seems to be a big culpret in this issue. You drive the truck enough to get the temp up, and while you are in the store the heat is transferred up to the carb where it boils the gas out. I had the same happen after I rebuilt my truck's engine.
The answer for me was a 1" phenolic spacer. It separates the heat from the gas that it was boiling out of the carb while I was in the store.
Carl, There are too many old trucks with the same setup still out there and still working everyday. Our trucks have a tremendous frontal opening, there is plenty air entering the engine bay area when it is moving forward. When you stop the heat will continue to rise and the system is doing what it is designed to do. If there is not fluid boiling out it is working properly.
Carb issues and old Holleys do rise up here often. Let's see if one of our carb sperts can jump in and help.