I agree with Ferm, that should have been out of a 2500 series truck. Search thru Hot Rod magazine on line, they did a build up with a 6.0L a while back, it made stupid HP on pump gas. Considering what the dealer said, with what your finding, I'd go ahead and double check it with a mechanical gauge, if you still don't have and oil pressure, pull the pan and have a look.
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