I can't see you gaining that much from what you say is a basically stock engine. Think of it as hp per dollar spent, $350 ok, $ 750 hell no!
It is hard to believe you pickup up a 75 hp gain on a stock L33. I did a search and most guys were saying 15 hp with a stock engine. Was you gain after adding LS6 intake, dual exhaust etc?I picked up 75hp...I'm sure there is more waiting to be unleashed. It's running pretty rich right now so I'm goin g to take it back for a few adjustments.
I agree, and Rhotpursuit's L33 has free flow exhaust, LS6 intake...but I was referencing a stock 5.3. I find it hard to believe the factory would leave 75 hp un-tapped.But consider that I have a lot of supporting mods to make the swap work, like a custom intake and catless exhaust. I think I have 20-30 horsepower hiding in there