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it would appear that it was adapted from a farmall. Also your cap does not look like it is fitting properly. 50s and earlier farmalls and allises were based on engine designs from the mid to late 30s utilizing magnetos. So to save costs, when distributors became an option, the manufacturers made distributors and mounts that would bolt in place of a magneto. Both the WD and farmall magnetos have the same mounting flange. Magneto mounting was pretty standardized according to my book "how to restore tractor magnetos." Magnetos were somehow thought of as sealed magic boxes, so when any type of failure was encountered, they were pitched and a distributor was added, as the cost was far less than a new mag.--the farmer assumed the whole thing was to blame, when for a few dollars it was likely points and condensor. There probably was some marketing done to push the magneto scrappage. The delco distributors were a popular conversion on both allis and farmall. Delco likely was offered by allis itself, as their new tractors came with delco distributors. IH had their own, so you had options there. Someone must have decided to use an ih distributor on yours, because it will fit. yours is the second i've seen in the last 18 months, second i've seen in my life, though.
The adaptor between the distributor and mag mount flange is definitely IH, the distributor could be another make, as there were some other companies making distributors for IH towards the end. If you can see some numbers on the distributor it would help ID it. I cannot answer the question of whether to keep it that way or not, I just know that it will bolt up, and that you have IH parts on your tractor. karl f
ps email is open
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