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Thread: Smallport head on bigport block

  1. #1
    Member
    Join Date
    May 2010
    Name
    Ben
    State
    VIC
    Location
    Glen waverly
    Country
    Australia
    Posts
    74

    Default Smallport head on bigport block

    Car - ae86

    motor - jdm bigport

    use - street/hills

    problem - none atm

    occurs/started when -

    personal situation - wanting to buy a head to port and polish and so on. So deciding wether to buy a smallport head or a bigport head.
    How does a bigport run with a smallport head?
    Power increase over bigport head or does the lower compression even it out?
    Thanks

  2. #2
    Ok
    Join Date
    Nov 2008
    Name
    Seamus
    State
    QLD
    Location
    Milton
    Country
    Australia
    Posts
    1,860

    Default

    There's no difference in compression changes between bigport/smallport heads, it's the bottom end that does it.

    And you really won't have any performance gains choosing one over the other. I would just use the head you have more accessories for (intake manifold, injectors, etc).

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