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Ford 335 engine
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===351M/400 identification confusion=== There exists debate as to what Ford meant by the "M" designation of the 351M. Some claim the "M" stands for “Modified” - being modified from a 400-V8 with a shortened stroke - though others claim that the "M" refers to the Michigan Casting Center, where the 351M began production. Some say that the "M" designation has no official meaning, and that it was just Ford's way of distinguishing the 351M from the 351C and 351W.<ref name="Bronco">{{cite web |title=History of the Ford 351M/400|url=http://www.projectbronco.com/History/history_of_the_ford_351m.htm|access-date=19 May 2014}}</ref> Ford master part catalogs reference the engine as a Modified.{{cn|date=June 2024}} Likewise, Ford's use of the 400 block in the creation of the 351M engine has resulted in the 400 mistakenly being referred to as the "400M" or "400 Modified." This is despite the 400 having been the design basis from which the "modified" 351M was derived and it was in production several years before Ford used the "M" designation. Further confusion arises from Ford printing "351M/400" on the emission stickers for the engine. The "351M/400" referenced the engine family, and some confused this with the engine name. This sticker also listed the engine displacement below the engine family. Ford's official name for the 400 V8 contains no additional designations - the proper nomenclature is simply "400." In the early 1970s before the 351M debuted, Ford referred to the 400 as the "400 Cleveland".{{citation needed|date=January 2023}}
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