C6 owner with a LS3 which of course does not have many miles on it.

This is what you get when adding so called mods that cyberspace "for profit" forums lead you to vendors who do not know or even care on what they are doing

Heads and CAM, blown engine within a few months, add the crap tune done and you see how much carbon pistons have and valves kissing them along with broken lifters.