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  1. 03-24-2009, 05:42 PM #1
    hec33
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    1999 Z28 M6

    Exclamation Factory Valve Spring Specs

    Does anyone know factory valve spring sizes (ID and OD), and installed heights in the '99 LS1's? I can find everything but this anywhere on the interweb... Thanks in advance
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  2. 03-25-2009, 07:12 PM #2
    hec33
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    Nobody have any info?
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  3. 04-15-2009, 08:50 AM #3
    KennethS
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    White Bird, Red Camaro
    91' Bird, 02' Camaro

    Bottom OD 1.214" ID 0.849"
    Top OD 1.020"-1.040" ID 0.648"-0.660"

    Typical stock installed height is 1.775" - 1.800"

    The last on I checked was from a 1998 LS1 head, it was 1.795"
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  4. 04-15-2009, 01:05 PM #4
    hec33
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    Thanks man, saved me a lot of time!
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