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  1. #1
    live fast, die young.
    Join Date
    Aug 2005
    Location
    santa ana
    Age
    38
    Posts
    141

    metallic blue
    1969 camaro

    compression on pump gas

    im getting a 350 that is 9.5:1 compression. im replacing the cylinder heads with the vortec style heads. my problem is that the way the vortec combustion chambers are designe, they raise compression. does anyone know ho much they raise the compression. and what is the highest compression i can run on pump gas 91 octane, this is goin to be my daily driver. thanks

  2. #2
    Junior Member
    Join Date
    Oct 2006
    Location
    Iowa
    Posts
    44

    black
    1993 Vette

    you will have to know the differance in combustion chamber cc's between the head I can't remember the fomula for CR but you can find it on many sites

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