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An LS3 block can take a hell of a lot of boost, the internals...no idea yet, 5-7 psi should be safe, you get a couple more over that and that's pushing it. All engines are going to be different, and there's always going to be some jerk that can run 3 more psi than everyone else and still be ok, if someone runs 2 psi less than his, their engine is going to go poof.
I didn't give you a solid answer, because I have no idea, but I know what's a good idea and what's not, so don't push it over 6psi until everyone and their grandma does it too.
BUT just keep in mind, "if something can go wrong it will". I guarantee some1 is going to hit 6psi and F up their engine, then going to complain because they voided their warranty and have nothing to drive.
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