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  1. #1

    Default 72’ Ironhead frame engine fitment issues

    Bit of backstory, my buddy bless his ambitious heart had this 1972 IH, the trans took a shit, he got frustrated and was talked into altering the backbone to accommodate an evo engine. So he cuts off the backbone, which he no longer has and installs a very solid piece of tubing to allow evo fitment. I acquire this frame from him later on, and have now come to a point of deciding what to do with it. I really have no desire to throw an evo in it, I have a 77’ engine sitting around however. It would seem like quite a waste to find another IH backbone and cut it off to replace this one. Would it be feasible to install the 77’ engine and weld a new top motor mount into place? I know the 77’ oil pump is a fitment issue for older frames, or so I’ve heard. I guess just looking for some thoughts, thank you
    Attached Thumbnails Attached Thumbnails 4F7AA6F5-A5A7-4177-ABE8-EEB9B40BF4CB.jpg   6E08CDE9-1CA5-4048-8EB2-A815F47B9908.jpg  

  2. #2

    Join Date
    Dec 2018


    Well, at least the '77 motor will line up and bolt into the motor mounts, and unfortunately, an evo motor will NOT. So, you are on the right track.


  3. #3

    Join Date
    Dec 2017


    Some info on the older Ironhead frames that may be of interest:

    OSKRG Research/Restoration Bulletin #1, REV.5

    1952-'72 K & XL Frame Model Year
    Determination Flow Chart:

  4. #4

    Join Date
    Apr 2013


    If the frame has a title it's worth fucking with.

    Check the xlforum regarding oil pump clearance modification. It's been done.

  5. #5


    It is a titled 72’

  6. #6


    im not a expert on ih sportys but a top motor mount is easily fabbed and welded on. the oil pump clearance could be challenging but nothing you cant figure out.

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