Re: Hot Engine
Flatheads run a bit warmer than overhead valve engines due to the exhaust gasses flowing through the long ports on the ends and siamese ports in the centers. The radiators can get gooped up over time and may need a rodding out. The blocks sometimes have old core sand and wire stuck in the coolant passages. Cylinder head gaskets can leak compression into the coolant passages. Even the ignition can cause overheating if the vacuum spark control diaphragm goes bad on the distributor.
If its not getting up to the H and blowing coolant out the radiator cap then it may be running normal for its condition. When all conditions are relieved, a person is hard pressed to make them overheat. Now if you climbing up mountain roads on a hot day with a heavy load, even a normal engine will start increase in temperature during the climb but should quickly cool back to normal on the down side of the hill.
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