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compression on pump gas

This is a discussion on compression on pump gas within the Internal Engine forums, part of the LSx Technical Help Section category; im getting a 350 that is 9.5:1 compression. im replacing the cylinder heads with the vortec style heads. my problem ...

  1. #1
    live fast, die young.
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    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
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    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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