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  1. #1
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    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

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    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.

    Jim

  3. #3
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    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:

    http://www.harleykmodel.com/technica...oskrg-1-v5.pdf

  4. #4
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    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
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    It is a titled 72’

  6. #6

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    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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