317 head swap
03-15-2009, 10:29 PM
#1
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317 head swap when i swap the 317 heads onto a 98 5.7 block is there any tricks or tips i need to know,parts i need besides head gasket of course?
do i need to modify a head gasket for the swap or use 5.7 or 6.0 stock gasket
i assume they are all the same
also does anyone have a good link to one of those head gasket thickness versus chamber size=comp. ratio charts for a stock displacement ls1
and any tips on gasket thickness/brand for running about 16 pounds of boost
thanx guys sorry for all the questions just trying to learn from experience
do i need to modify a head gasket for the swap or use 5.7 or 6.0 stock gasket
i assume they are all the same
also does anyone have a good link to one of those head gasket thickness versus chamber size=comp. ratio charts for a stock displacement ls1
and any tips on gasket thickness/brand for running about 16 pounds of boost
thanx guys sorry for all the questions just trying to learn from experience
03-16-2009, 06:34 AM
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Yeah, go with ARP head studs for 16 lbs. I got some used from a local shop for about half the price as new. I went with 6L Corvette MLS gaskets. I just went to a dealer and ordered them. It's nice to have friends!(discount!)
03-16-2009, 07:01 AM
#4
317 heads on a 346 with 0.054" gasket will have a 9.4 static compression ratio with -2cc pistons. Definitely want to go with 6.0L gaskets. Even with ARP head studs, it is going to be hard to keep the heads from lifting with 16 psi. The tune is going to have to be dead nuts right on.
03-16-2009, 07:44 AM
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317 heads on a 346 with 0.054" gasket will have a 9.4 static compression ratio with -2cc pistons. Definitely want to go with 6.0L gaskets. Even with ARP head studs, it is going to be hard to keep the heads from lifting with 16 psi. The tune is going to have to be dead nuts right on.
already have the head studs.maybe i need to order a set of heads with a little bigger chamber
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03-16-2009, 10:25 AM
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72.27cc = 9.1 CR
71.71cc = 9.2 CR
71.05cc = 9.3 CR
70.59cc = 9.4 CR
70.03cc = 9.5 CR
69.74cc = 9.6 CR
68.91cc = 9.7 CR
68.35cc = 9.8 CR
67.79cc = 9.9 CR
67.23cc = 10.0 CR
66.67cc = 10.1 CR (stock LS1 head spec)
66.11cc = 10.2 CR
65.55cc = 10.3 CR
64.99cc = 10.4 CR
64.43cc = 10.5 CR (stock LS6 head spec)
63.87cc = 10.6 CR
63.31cc = 10.7 CR
62.75cc = 10.8 CR
62.19cc = 10.9 CR
61.63cc = 11.0 CR
61.07cc = 11.1 CR
60.51cc = 11.2 CR
59.95cc = 11.3 CR
59.39cc = 11.4 CR
58.83cc = 11.5 CR
is this not correct here,i show that a 317 head has a 71cc chamber and with a 2cc relief would i not be right around 9.0 to 1,if im not correct could you explain why
71.71cc = 9.2 CR
71.05cc = 9.3 CR
70.59cc = 9.4 CR
70.03cc = 9.5 CR
69.74cc = 9.6 CR
68.91cc = 9.7 CR
68.35cc = 9.8 CR
67.79cc = 9.9 CR
67.23cc = 10.0 CR
66.67cc = 10.1 CR (stock LS1 head spec)
66.11cc = 10.2 CR
65.55cc = 10.3 CR
64.99cc = 10.4 CR
64.43cc = 10.5 CR (stock LS6 head spec)
63.87cc = 10.6 CR
63.31cc = 10.7 CR
62.75cc = 10.8 CR
62.19cc = 10.9 CR
61.63cc = 11.0 CR
61.07cc = 11.1 CR
60.51cc = 11.2 CR
59.95cc = 11.3 CR
59.39cc = 11.4 CR
58.83cc = 11.5 CR
is this not correct here,i show that a 317 head has a 71cc chamber and with a 2cc relief would i not be right around 9.0 to 1,if im not correct could you explain why
03-16-2009, 10:38 AM
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03-16-2009, 10:42 AM
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damn here i was thinking i was going to be perfect now i might have to change pistons or heads
so at 9.4 you guys think i will be pushing it with 16lbs.
so at 9.4 you guys think i will be pushing it with 16lbs.
03-16-2009, 04:04 PM
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well that was my next question ,i plan on meth and im running the fmic from epp
will i be good
ive seen people claiming just as much and more boost on more comp. with meth
a guy was saying he puts 700 rwhp through a stock c5 with just different springs and cam i believe
so i cant see why my setup would not be doable
thanx for the help
will i be good
ive seen people claiming just as much and more boost on more comp. with meth
a guy was saying he puts 700 rwhp through a stock c5 with just different springs and cam i believe
so i cant see why my setup would not be doable
thanx for the help
03-16-2009, 07:45 PM
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Dont mean to be a thread thief, but I am considering the same heads, and I needed to know if PRC's for stock ls1 (241) heads will fit on the 317's and also if I need to use a stock length push rod or a longer one, I have a stock bottom end and am changing to relieve some pressure and save face till I can forge the bottom. Thanks, Sorry again for interjecting
03-17-2009, 12:06 AM
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I'm also getting ready to do the 317 head swap but I bought gm mls gaskets for the 5.7L. I held the gaskets up to the heads and they lined up perfectly. How would I tell the difference between the 2 gaskets besides on e saying 6l on it? I just really want to know if I need to go and buy new gaskets before I take my top end apart. OP, I'm sorry for hijacking the thread I just want to be sure that the gaskets I have won't fit.
