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  1. #1
    Join Date
    Sep 2004
    Location
    North Vancouver, British Columbia
    Posts
    155

    nOOb question... im sorry

    This is really sad, but it has been bugging me for some time.



    Can someone please explain to me what 18 degree and 23 degree heads mean?

    What are the differences? Which is better? pro's con's?

    What is stock on a SBC?


  2. #2
    Join Date
    Mar 2003
    Location
    Kirkland, WA
    Posts
    886
    It is the angle of the plane of the valve head relative to the block mating surface I believe (or something pretty close). The 18 degree head ought to flow more, but is probably overkill for everything but the stoutest motor. They also tend to be more expensive, and require a whole bunch of unique prts, including valvetrain and intake manifold.
    James
    -1969 Camaro Sport Coupe
    -1996 Z28
    -2005 Silverado
    Webpage

  3. #3
    Join Date
    Sep 2004
    Location
    North Vancouver, British Columbia
    Posts
    155
    Ok that is what i thought. Thanks.