These are apparently all variations of what is loosely (at least in parts catalogs) called/known as the Wauk "150" engine. A 56 Fed-Mog shop specs manual shows both of the Crosley 2 Cyl's with OE part numbers "150xxx", similar to the Wauk OE numberng system used with 130s (130xxx) etc at that period. I don't have anything that lists the Cub Twin or its OE part numbers. As John says, the Hist Soc (wehs.net) can give you more precise info on your unit.
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