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317s on a 4.8 LR4

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Old 06-23-2010, 01:06 PM
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Default 317s on a 4.8 LR4

will this work? I have a lot more access to well priced 317s than I have 243s
Old 06-23-2010, 04:24 PM
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anyone?
Old 06-23-2010, 05:17 PM
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why not?
as long use 4.00+ bore gaskets will be alright. and scr will be in the mid 8s depend on amount milled from heads abd gaskets used.
my 4.8 is equipped with 317 heads milled .005 and ls9 head gaskets and studs. and i plan on up to 15+ psi on pump gas without meth. and fmic
Old 06-23-2010, 05:25 PM
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Originally Posted by NemeSS
why not?
as long use 4.00+ bore gaskets will be alright. and scr will be in the mid 8s depend on amount milled from heads abd gaskets used.
my 4.8 is equipped with 317 heads milled .005 and ls9 head gaskets and studs. and i plan on up to 15+ psi on pump gas without meth. and fmic
wheres your CR?
Old 06-24-2010, 05:19 PM
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8.6:1 scr.
Old 06-24-2010, 05:23 PM
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whats did the .005 mill bring the combustion chambers up to? 68cc?
Old 06-24-2010, 07:18 PM
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Have you thought about using 241's?
Old 06-24-2010, 11:03 PM
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I have, but my understanding is the 243/317 heads flow more
Old 06-25-2010, 07:29 AM
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Yes thats correct. 317s and 243s are the same except diff chamber sizes. They do flow slightly better than 241s but Im not sure how much of a diff itd make on an FI engine.
Old 06-25-2010, 01:40 PM
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Originally Posted by IT_SS
whats did the .005 mill bring the combustion chambers up to? 68cc?
correct. with ls9 gaskets and 4.8 flat top pistons no vr's

Originally Posted by IT_SS
I have, but my understanding is the 243/317 heads flow more
the 243,799 and 317 all use same intake and exhaust ports, same size intake and exhaust diamater valves. chambers are different and 317 has larger volume chamber
Old 07-14-2010, 11:58 AM
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so i... was made an offer I couldn't refuse on a set of stock 317 heads, so.... now I'm trying to decide if I need/want a 2 step, more gear (thinkin 4.11), or a small shot of the "juice"..... The Juice/2 step would be an aid at the track, but I think the 4.11 would help a bit around town....

opinions and insults welcome
Old 07-14-2010, 01:17 PM
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what type turbos?
Old 07-14-2010, 01:34 PM
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Originally Posted by NemeSS
what type turbos?
TC66s, .58 exhaust AR, originally spec'd for a 5.3/T56
Old 07-14-2010, 01:51 PM
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t3?
are u worried about lag?
i was originally gonna go with t4 t88. but ive began constructing tt manifolds for my car. i really want to use mpt60 t4's with 3in dp.
im not worried about lag with those turbos. but i may end up going with t3 version. still debating.
Old 07-14-2010, 02:01 PM
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no, T4, the smallest T4 cover avalible from FI, and lag is my concearn

Last edited by IT_SS; 07-14-2010 at 02:07 PM.
Old 07-14-2010, 02:24 PM
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i dont think lag with those turbos will be so bad. even with the lower scr.



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