415 CI Forged rotating assembly
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I'm not sure if the 5.3 block could be bored that large without sleeving it. You'd be better to just pick up a junkyard LQ9 bare block or short block to start with. I suppose you could run boost but a very small amount, like 5-6psi with a very good tune. It's a high compression setup for NA/Nitrous applications.
-Kevin
-Kevin