Thanks for your input and information. I downloaded some data from the Wisconsin Historical Society web site and it is starting to make more sense. It appears like IHC used the continental engines prior to the No. 64 Harvester. Two engines are listed for the No 64 Harvester. See attached picture. One is the Farmall A tractor engine and the other is the Farmall Cub engine. Most of the original manuals on ebay are for the A engine which is much bigger so I would guess most of the No 64 Harvesters had the A engine. But who knows. At least it's making more sense. If you see something wrong in my logic let me know.
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