Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
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With what has been changed already I would start with a oil pressure test and an oil sample test.
A screwdriver and you ear will be the easiest way to determine. Hold the screwdriver against your ear and the engine determining where the noise is most prevalent.
An oil pressure test is done at a port different from where the gauge gets its reading. I suspect you have a worn cylinder head dropping oil pressure causing the knock. Due to the amount of metal that is removed I strongly suggest not attempting to repair if this is the case.
Slick 50 can not do what they advertise.
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