i have a 5.3L LS4 but since there arent many performance mods for the LS4 I'm looking for a LS6 performance cylinder head (the LS4 and LS6 share the same cylinder head) anyways does anyone know of a really top notch cylinder head??? Or a few at least they can recommend?

 

neat what improvement will it be afterwards.. i got a 07 ss

 

i have an 06' ss. i dunno about the gains but i would like to. i have also hear that you can swap some ls1 parts. like throttle body, then bore it to 5.7 and insert the 5.7 pistons. (same crank) this is all from what i have heard. some heads, throttle body, and a bore i think could put you somewere around 400 i fyou tune it properl