Small Block Intake Port Size - NCRS Discussion Boards

Small Block Intake Port Size

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  • Jimmy G.
    Very Frequent User
    • November 1, 1979
    • 975

    Small Block Intake Port Size

    Does anyone know when Chevrolet moved from the smaller intake port heads to the larger size? I suspect 1957 but need some help with specifics.Small was approximately in inches 1.75 x 1.125 and the larger was 2.0 x 1.375.
    Founder - Carolinas Chapter NCRS
  • Rod K.
    Very Frequent User
    • April 1, 1990
    • 441

    #2
    Re: Small Block Intake Port Size

    '57 3740997 heads are approx 1.125 X 2.000, same as some 3973487 heads I have, mid-70s 350 I think.

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