Before I would pull all the bearings out or look at them, I would pull the plate off of the bottom of the oil pump and see how worn that is. If the gears in the oil pump have much of any end play that's where you'll loose the pressure. You can put new bearings in or check the clearance on the old bearings but if your pump has too much clearance you just wasted all that time and money on bearings for nothing.
You just can't check one thing, you need to check everything in the oil circuit. I put together a Farmall H tractor and the bearings had 3.5 thousands clearance and the oil pressure is fine. I also checked the oil pump and had to resurface the bottom plate in the oil pump. I've got execellent oil pressure even after running an hour or more. Let us know what you find.
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