I currently have a 408 with an sts turbo with ls1 head ported pretty good. My ? is would it be worth it/help to go to 317 lq9 heads? Are the 6.0 heads better for boost? Do these flow better? I cant afford afrs. Any info would help thanks.

 

depends on the flow numbers of the ported ls1 heads. 317 have a 72cc chamber. And flow like a 243 head. good for lowering the compression which means easier to tune, and more boost can be applied.

 

it depends on how good they are ported bigger valves,5 angle cnc'd

 

The heads are supposedly ported to the max & have over $1k into total machine work and vavles. I heard the deck height wasnt high enough and the heads would lift at over 12psi? This is what I was told by a tuner. Whats the most 5.7 241s can flow on a 408 boost wise for a rearmount?

 

I would stick with what you have until you can sell your current heads and afford a thicker deck aftermarket head, like the AFRs.

 

I would wait for some afr or other thicker deck heads as well. Or look for a used set see them once in awhile.
stock 317 would be ok for cheap and would as said lower compression a bit.

 

I run out the box patriots stg3 and the spring kit with arp studs no hint of lifting but im on a safe tune.

 

Where did you order the patriot heads from? How much are a set of those? Are using the patriot ported lq9s? Whats the part #?

 

Patriot heads are great. I had some on an old setup and they are good stuff. The 317 will net you a larger combustion chamber. You could run a higher boost with those heads, I would say 18 would be safe. I have a friend tha tis running 15 on 91 octane on stock 317's. 760rwhp on a 370.

 

outlawz racing what size turbo are you running? Are you a 6 speed?

 

My car made 701rwhp with MTI 317 Heads very small STS Twin and small MTI Cam.

I'm thinking about going 408ci how much power are you looking for?? lots of pepole made 800+rwhp with stock heads casting.