Banjo79
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A mechanic I am not, but since the oil pressure switch is incorporated with the mesh screen, supposedly to filter the oil to the lifters, it might be possible that the area wasn't cleaned properly and debris has entered and gone straight to the lifters. Your working pretty blind on that job. I think before spending thousands, I'd be doing an oil flush, probably a couple (as in with a product), as recommended by Skylarking, though be warned it may create even more issues in an old engine, though you may have nothing to lose. After that a bottle of the trusty Nulon lifter free. If those two things do nothing, yep you have issues.
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