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Military F-head

Discussion in 'Early CJ5 and CJ6 Tech' started by Kory S, Oct 4, 2021.

  1. Oct 4, 2021
    Kory S

    Kory S New Member

    Youngstown Oh
    May 28, 2019
    Just purchased a so called military f head engine. Can someone ID differences between a regular and a military version? It has a 1 3/4” crank bolt and cast crank weights instead of bolted and welded crank weights.

  2. Oct 4, 2021

    PeteL If it wasn't for physics, and law enforcement... 2022 Sponsor 2021 Sponsor 2020 Sponsor

    Hills of NH
    Aug 3, 2003
    For a start, different carb. Has a engine lifting loop over the center of the valve cover. Double groove crank pulley. Massive bulletproof fuel/vacuum pump with priming lever. Waterproof 24volt distributor. Bellhouse has threaded drain plug for u/w operation. Etc etc. But most of those identifiers are bolt-on.

    Possibly "MD" engine number prefix may be an indicator, if the block hasn't been milled.
    Last edited: Oct 4, 2021
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