Everything has about been covered. Something easy to check, be sure the oil is not contaminated with gas. That can happen gradually if running rich, or it can flood the engine if the fuel valve is left on when stored.
Like said, those don't need much oil pressure. Being a flat head, there is no need for high pressure, no rocker arms to oil.
If you can get any pressure at all at warm idle, and the pressure will come up to 10-15 revved up, and there are no new noises, like deep knocking under load or rattles when coasting down, it will go a long time.
Gradual pressure loss is normal for a well worn engine. But sudden loss, or total loss, or fluctuating pressure, is a sign that something has changed.
One thing that will not increase idle pressure is stretching, shimming, or putting a stronger spring in the relief valve. As long as the relief valve is seating fully, it only effects high speed oil pressure.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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