Generation IV Internal Engine - 317 HEADS for boost?
05-08-2012, 10:18 AM
I have some 317 heads i wanted to use on my turbo build i was wondering if there is anything wrong with using these besides the deck height, will the valves be okay and everything ?
05-25-2012, 08:57 PM
I run 317 on my twin turbo 408 using E85 and have regularly hit 18 pounds of boost with stock valves. Using LS9 head gaskets. No problems at all. I would highly suggest stainless valves to be safe though. I'm installing some now before I break a valve.
05-25-2012, 08:58 PM
I also know people hitting 24 pounds of boost with them all the time. Also using stock valves.
08-11-2012, 02:22 PM
what would one get to use 317 heads on an ls1?
08-11-2012, 08:59 PM
Nothing. They bolt on just like any other LS head. I run LS9 gaskets with them for boost.
08-12-2012, 02:39 AM
how high of boost would you go to get 550ish hp with a T76 .81 turbo on a stock LS1? good tune and all
09-21-2012, 02:26 AM
10-12-2012, 08:56 PM
anyone? any boost numbers?
10-15-2012, 04:06 PM
the 317 heads flow great out the box and ported forget it there a good cylinder head and the valvetrain holds up good as well
10-15-2012, 05:55 PM
thats what i keep getting on them. they seem to be the go to heads for affordable heads for boost. im 90% sure i want to go with 317 heads. I read really good things about them from mild setups to pretty crazy HP numbers. Im going to stick to about 10psi myself.
what i found odd is that if i go with 317 heads, according to the CR calculators, using even .040 cometics gaskets, the CR isnt that much lower on a stock LS1.
heres some calculations i got
with 317 heads 71cc, stock gasket .058, 9.6:1 CR
with 317 heads 71cc, LS9 gasket .051, 9.7:1 CR
wtih 317 heads 71cc, Cometic .040, 10:1 CR (thats 10 even. not 10.1:1)
so with that added in there, im probably going with 317 heads. also gonna do a cam with them to make up any possible low end lose. not sure if i should go with the LS9 gasket or go .040 for more optimum quench.
still wondering if anyone has expreienced boost numbers on these heads. perferably without meth in the mix. or E85 lol
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