Just like sprayed 99 said. No gains. The 317 head does flow like a LS6 head BUT has 72cc chambers. Which makes good for a F.I. car, but not N/A.

I do have a set 2000 LS1 heads which will give you some gains. You would be going from 62cc to 64cc, but you will pick up power from the biger vavles and the flow........... $150