Bryan, carefully examine that oil pump, when you do the tear down. Those have been known to have the relief valve/plunger stick open. Not trying to start an oil pump war, just saying that it's happened before. I'm doing a 5.3 build right now for my nephew, and went with the Melling 295, and I checked it inside and out before installation. Hopefully you'll get your engine woes straightened out on the next one...that has to be getting VERY expensive.
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