317 01 and up LQ4 6.0 aluminum center bolt heads

what would these do for my car ...and a little info on them
i tried searching didnt find to much

thanks

 

or would you guys suggest 5.3 heads

 

5.3 work for me!

 

are they stock 5.3s and what kinda gains did you get?

 

Out of the box 5.3l heads won't work very well at all. The 6.0l head is designed for a bigger bore so you'll kill off some compression installing them stock. For the money you might look at the PRC Stage 1 LS6 or my favorite the Stage 2.5 5.3l heads For the money they make power compareable to the major aftermarket castings at half the price!!

http://texas-speed.com/shop/item.asp?itemid=84