i have the truck in my sig..but i know a guy that has a blown up ls1 that has a good top end i was going to swap the intake but i dont thinks its worth the gains...correct me if im wrong but anyways i was wondering about the heads? will they be any better bigger valves? hell i dont even know what size mine have but any advice will help i was thinking about getting them and having them milled a little to bump up the compression but just a thought thanks bryce

 

The topend of an ls1 is not worth your time, heads flow similarly to what you have, and your intake is good enough. ls6 heads and intake would be worth the swap though

 

Putting the ls1 heads on there will drop your compression and the ls1 intake would just help the looks department but not really any performance gains

 

ok thats what i figured about the intake and i wasnt sure about the heads welp i guess i wont bother with it then