Re: Cooling observances and hypothesis
There are a lot of opinions as to why these old flatheads run hot at high speed (65-70 mph). So, here is my opinion. These engines are generating a considerable more power at these speeds than at 55 mph. More power = more heat. I do not believe these cooling systems were designed to cool at the higher speeds.
I have had pretty good luck with Drake water pumps, clean radiator, and "Water Wetter".
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