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Thread: 4D55/4D56 Head Differences

  1. #1

    Array
    Status
    Offline
    Join Date
    03-21-2017
    Posts
    6
    Location

    Home, PA
    Vehicle

    1983 Dodge Ram 50
    Engine

    4D55-T

    4D55/4D56 Head Differences

    Bought an '83 50 with the 4D55T. Previous owner claimed it has the 4D56 head. Valve hung up and ruined the cam so I pulled the head. Has the tappet rockers, not the rollers. Just wondering what the visible differences are between the two heads so I can tell which head it actually has?

  2. #2

    Array
    Status
    Offline
    Join Date
    01-18-2015
    Posts
    250
    Location

    Inwood WV
    Vehicle

    1991 Mitsubishi L200
    Engine

    4D56-T
    The head alone, the only thing i know thats different is the injector thread size. Only thing else is they come with roller rockers

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