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Thread: big port head and small port

  1. #1
    Junior Member
    Join Date
    Jun 2010
    Posts
    19

    Default

    does big port and small port heads have different compression when put on a engine? If i put an Na bigport head on my 4agze smallport engine will that change my compression?
    cheers

  2. #2
    Senior Member
    Join Date
    May 2010
    Name
    Fletcher
    State
    NSW
    Location
    Wollongong
    Country
    Australia
    Posts
    121

    Default

    the head chanber volume is the same between bigport and smallport so no.

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