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Blueprinting a stock pump? Yes. Actually "porting" it? No, at least not on an LT1. I have heard the LS1 guys doing it, but since the LT1 is a typical SBC there's no real benefit.
yeah i found the same thing about ls6 ported oil pumps being a big deal, but wasnt sure on ours, do you know what the tolerances/clearances are supposed to be?