Re: Low oil pressure
The more wear you get on the main and rod bearings, the lower the oil pressure will be. The 8BA family of engines had no lifter galley oil psi relief valve. They only had the one in the later type oil pump. Shimming or replaceing the spring in the galley relief valve will bring the pressure back up as long as the crank and cam bearings are still in fair condition. This stuff doesn't last forever. At some point old flatheads need an overhaul. If you put a real heavy spring in the upper valve, the oil pump relief valve will regulate it as high as it will ever go. If it is still low after that then I'd figure the bearings are worn excessively.
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