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Thread: 317 Heads with Comp 918 Springs

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  1. #1
    Join Date
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    Come on Guys take these off my hands!!!
    06 TrailBlazer SS LS2 4.10's

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    Full Bolt-On 370 - Little Cam- Victor Jr Intake -Worked 5.3 Heads - 4.56's - Built 60E - Circle D 4000

    07 CTS-V CAI, GM Performance Exhaust, Ported TB, Coil Overs

  2. #2
    Join Date
    Jun 2009
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    Those heads have the 4.0+ bore? Wouldnt work on my 4.8 with the 243 heads, right?

  3. #3
    Join Date
    Oct 2008
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    Quote Originally Posted by Mang213 View Post
    Those heads have the 4.0+ bore? Wouldnt work on my 4.8 with the 243 heads, right?
    243 and 317 are same,
    317's just have bigger combustion chamber for lower compression
    2002 Tahoe 4.8 - soon to be turbo'd - SOLD
    1989 Mustang - LX Vert - 351W-TT - 2inches of dust covering it
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  4. #4
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    I thought they were the same, but wasnt positive. So the bore size isnt an issue, since these heads came from a 6.0? I thought the LQ4 had larger valves than the 4.8

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