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I have a 1992 chevy 5.7 liter v8 4×4 it the burns 1 quart per 100 miles. The engine has 120,000 miles. The knock sensor went out. It was replaced. The head gasket was leaking so it was replaced. The spark plugs are not fouled up. It does not miss so it seems not to be piston rings. How do I tell if it’s valvery seals. I have watched videos and see you can do it with the head on. Other than compression test is there any other test I can do to diagnose the isssue. And it only smokes when you step on it hard. After a cold start it leaves black oil on the garage floor. Thanks in advance. Any help would be appreciated.
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