Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
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when you had the pan down, did you drop a main and rod bearing??? they are usually the real issue with low oil pressure.
was the pick up screen clogged with debris??
ok, and the bearings?????
ok, the lifters are making noise most likely from the lack of pressure. you will need to check the bearings as they most likely are the cause of the low oil pressure