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Old 07-09-2010, 07:16 PM
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I wouldn't let it bother you too much- Chevy never called their 396 BBC engine a "BBC", either- but it's known what you mean when you type 396 BBC, just like it's known that a "400M" is a Ford 400cid engine.

So, while "400" may well be the one and only true correct designation for the 400M, I will continue to use 400M (incorrect as it may be) as a way to discern it from any other 400 engine, or typing out "400 Ford" or 335 series 400", or "the 400 Ford that looks like the 351M engine", etc. It is just easier and it assures there's no confusion.