Oil Pressure

hi, at the back end of the left rear oil galley ,there is a plug required.most people forget to install it back in motor. all you need to do, is pull dist, use a small mirror and light ,look down in there. I have seen this same thing before
and turned out to be missing rear oil galley plug. leaving out the one in bottom of block, would have no pressure and you would have lost the bearings before now.