Mystery engine
Are you sure that the bore is 3 1/2? If it’s 3 9/16 you could have a 224 engine from a Canadian GMC truck. I haven’t seen one but it is listed in my 1939/40 Canadian shop manual. It was a Canadian manufactured engine for the GMC and basically seems to be similar to the 216 but with a larger bore and aluminum pistons. It was probably made obsolete by the 235 engine introduced in 1941. If it is a Canadian built engine that may be reason for the odd casting numbers.
Paul
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