408 + stock 317's
11-16-2007, 06:07 PM
#1
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408 + stock 317's has anyone made any big #'s with stock 317 heads??
i'm going to go this route jsut to get the car running again. Then upgrade the heads later on.
i'm going to go this route jsut to get the car running again. Then upgrade the heads later on.
11-16-2007, 10:33 PM
#7
I am putting togehter a 408 with 8.5CR and lightly ported 317 heads and a 80mm front mount turbo this winter. I am not going for max effort and will mostly be a street car but should spool like a bitch and yet make some dencent enought numbers up top 
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11-16-2007, 11:28 PM
#8
Exotic performance tuned it, but it was built completely by Fast Track Performance.
A casting with a thicker deck will be able to take more cylinder pressure without lifting. I had about 30 passes on the car at 920 rwhp and when I pulled it apart it was leaking at the bottom of most cylinders. It did not cause any problems. Everyone making alot of power has pushed water at some point...just depends on how you decide to deal with it. Some race on them that way for awhile and switch them out right away. What kind of power are you wanting to make?
A casting with a thicker deck will be able to take more cylinder pressure without lifting. I had about 30 passes on the car at 920 rwhp and when I pulled it apart it was leaking at the bottom of most cylinders. It did not cause any problems. Everyone making alot of power has pushed water at some point...just depends on how you decide to deal with it. Some race on them that way for awhile and switch them out right away. What kind of power are you wanting to make?
11-23-2007, 11:06 PM
#15
Those are the parts I used. Small valves they were patriots to start with a lilntouch upnwork and a new valve job.
40 less cubes and an S88 I made over both of your power goals. Now at that power I was even pushing water on the dyno. That same amount at the track lifted both heads and put water in three cylinders.
1130 is the most I've made at 26 psi. Its the lifting the heads part that gets to you on a stock casting. I'm going with the new 1" thick deck World Heads
those and a bigger turbo and a couple new tricks for lifting the heads
Kyle
11-24-2007, 03:38 PM
#17
05-30-2008, 02:09 PM
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bump. any updates on people running stock 317's??
i've been trying to do research to see how much CFM they can flow stock, but cant find any. i wonder if i'll create alot of back pressure if they can't flow enough unported :dunno:
i've been trying to do research to see how much CFM they can flow stock, but cant find any. i wonder if i'll create alot of back pressure if they can't flow enough unported :dunno:
05-30-2008, 02:49 PM
#19
I'm using a stock unported set on my build - 347 though. I'm not going for earth shattering numbers though, just a street car hoping for low 11s outta the box on 8-9 lbs, then going to a th400 /12 bolt or 9" next season or the following going for 10.0s on 14 lbs. Check out my sig for info. I'm thinking it'll do around 550ish on 8-9 lbs and maybe crack 700 on 14 eventually.
