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You may have an upgraded oil pump installed in your engine. The Model A oil pump by itself delivers about 80 psi, along with a huge volume. I wouldn't try this at home, but if you need further evidence you might take a rebuilt pump, chuck it into a 1/2" drill and give it a spin in a pail of oil. Wear a rain suit.
The pump looses 90% of it's pressure and volume at the point of gearing in the block.