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317 or ls6 heads

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Old 06-09-2009, 08:08 PM
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Default 317 or ls6 heads
im running 317s on my 6.0 wondering if i should go with the ls6 heads or should i pull my 317s and have the machine shop build better heads with bigger valves and would it be cheaper then buying stage 2 heads
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Old 06-10-2009, 05:55 AM
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Originally Posted by droppedchev
im running 317s on my 6.0 wondering if i should go with the ls6 heads or should i pull my 317s and have the machine shop build better heads with bigger valves and would it be cheaper then buying stage 2 heads
317/243's are identical . . . except for the combustion chamber. Unless you're getting the Z06 243s, they're the same.
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Old 06-10-2009, 07:17 AM
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oh alright im just going to pull those 317s and mill them down .30 bump up the compression alittle bit
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Old 06-10-2009, 05:31 PM
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Milling the heads .030 is going to put your compression at what? And the intake is still going to line up good with taking that much off?
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Old 06-10-2009, 05:34 PM
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Originally Posted by Beatdown Z
Milling the heads .030 is going to put your compression at what? And the intake is still going to line up good with taking that much off?
Milling the heads .030 is nothing, and the intake will fit fine. The pushrod length is the main thing to consider.
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Old 06-10-2009, 06:09 PM
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yeah it all lines up just gotta break out the tool to measure the pushrods should bump the compression to 10.5to1 maybe more
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Old 06-10-2009, 06:11 PM
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i wonder if i take 706 heads off my 4.8 it will do to my 6.0 i know it wont flow as good but that will bump the compression
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Old 06-10-2009, 06:18 PM
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If its on an LQ4, it'll be a lot closer to 10:1
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Old 06-10-2009, 06:31 PM
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yea thats what it was i thinking how much you think i can mill down and still keep the 7.4 pushrods
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Old 06-10-2009, 06:33 PM
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Originally Posted by droppedchev
yea thats what it was i thinking how much you think i can mill down and still keep the 7.4 pushrods
I'm gonna go with not much.
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