Generation III Internal Engine - PRC stage 2.5 ls6 heads....

I was wondering what kind of results people had with these heads. Power increases and 1/4 mile performance would be appreciated the most , but all experiences are welcomed.
I already have ls6 heads, so i would like to know if the increase over the factory ls6 heads will be noticeable. Before and after comparisons would be great. My cam doesnt have alot of duration and is around .600 lift.

Most say they are good for 35rwhp or so. I gained 100rwhp from those heads, a torquer V3 and FAST 92. Before and after was done on the same dyno.

^ must say good numbers on the mustang Dyno.

Most say they are good for 35rwhp or so. I gained 100rwhp from those heads, a torquer V3 and FAST 92. Before and after was done on the same dyno.

I'd be happy with 35 rwhp. Did you already have headers before the head and cam?

I will be upgrading from factory ls6 heads, a little worried my gains won't be as high as going from 241s.

I can't make up my mind. I thought about sending my 799's to Advanced Induction and having them CNC'd or just getting a set of PRC LS6's. To many decisions

I have the PRC LS6 2.5 on my car. I think they are a worth a solid 35rwhp.

Here's some AI work since you mentioned it:

http://ls1tech.com/forums/generation-iii-internal-engine/1533200-advanced-induction-226cc-cnc-work.html

I think either (PRC or AI) would be a good choice honestly. There are some other good head porters on this board as well.

I'd be happy with 35 rwhp. Did you already have headers before the head and cam?

I will be upgrading from factory ls6 heads, a little worried my gains won't be as high as going from 241s.



Yeah, I already had headers & lid. You'll probably gain 15-20 from porting your factory ls6 heads.