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Hi Bill, For the most part, oil pressure is determined by pump, crank bearings, camshaft bearings and their connecting passages. Doubt if your head workings has much to do with the pressure issue unless you have a massive leak at a feeder line or some such thing. But, that would probably show up cold as well as hot Now, in reality, an engine really only needs about 8 lbs of true oil pressure to operate without eating itself up, but we always like to see 'er up there around 30lbs or so when hot. Some manuals will tell you that bearing oil clearance can be considered "okay" if it is as high as .003"; some of these young hot rodders even run their engines with a clearance of .005". I always set mine right at .0015" (minimum clearance is considered by most builders to be at no less than an absolute .001"). Never had an oil pressure issue yet and I've built a trainload of engines. Just my view, Allan
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