8717 was built in Jan. 1940. Probably the original low compression head with 3/8 threads in head for a manifold attachment. Good chance it was a non gas manifold originally. Head was cast close to tractor build time. If 4-15-O is the date code on block that makes it cast in 4-15-1945. Hard to tell a O from Q on them. If a Q 1947. If the engine came from another M it will have a serial number stamped in the block just above the right side cover on a raised flat area near front and in a area below the first spark plug. First three letters of a prefix before the number would be FBK. If the block was purchased as a replacement it may not have a serial number. Should have a 4 number block casting number on block above oil filter in raised numbers. Will have a two letter suffix. if no serial number the cast number and suffix letters may narrow the ID down.
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