I would not consider the RPM to be a factor. The issue is happening while still putzing around at High Idle and less. Leave the cap loose (if it is a pressure cap)and get it warmed up to the point that the gauge is in the middle of the range. Remove the cap (carefully) and look for flow. Use a candy thermometer to check the temp of the coolant in the tank. If it is flowing well, the issue might be deposits in the tubes. If not flowing it is either plugged tubes, or a mechanics rag left in the water jacket (I've done it in my youth) Jim
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Today's Featured Article - The Fordson F Ignition System - by Anthony West. A fellow restorer contacted me earlier this year asking for some help and advice on a model F that he was restoring. He had over a period of months spent a fair amount of his hard earned cash on replacement parts for the old "trembler" ignition. Sadly though all his efforts seemed to be a waste of time and money as he still couldn''t get the temperamental old thing to run correctly!! If i said that this was a little frustrating for him that would be "conservative" in fact the problem had reduce
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