I’m no expert with building engines so bare with me but let’s say I want to realistically make 430 crank horsepower out of a 5.3 without touching the internals so basically from the heads and up to the top of the motor what can I do to make that kind of power or would I be better off just buying a 6.0L from a Escalade and doing heads and cam with a full exhaust As far as money I’m not really trying to cut corners so if I have to pay to play that’s what I will do I just want to do it right let me know what’s best

 

Post #6 is representative of what you're talking about.

https://www.thirdgen.org/forums/ltx-...o-results.html

A 6.0L will clobber a 5.3L.