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Thread: how can you tell if your head is a 4d56 head?

  1. #1

    Array
    Status
    Offline
    Join Date
    11-28-2013
    Posts
    63
    Location

    Canada
    Vehicle

    1986 Dodge D-50
    Engine

    4D55-T

    how can you tell if your head is a 4d56 head?

    Just pulled the valve cover & got me thinking, what if the previous owner had already put a 4d56 head on it? How can you tell?

  2. #2

    Array
    Status
    Offline
    Join Date
    04-29-2014
    Posts
    66
    Location

    los angeles
    Vehicle

    1985 Mitsubishi Mighty Max
    Engine

    4D55-T
    4d56 has roller rockers. 4d55 doesn't.

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