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Old 09-11-2012, 10:09 AM
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how to tell the differance from a 351M&400M

I have an M class engine and was wondering how to tell what I have? 351M or 400M? Is there a casting number on the outside that would be differant from each engine?

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Old 09-11-2012, 05:34 PM
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The only way to tell that I know of is to pull a plug and check the stroke height. There is no visual difference externally between the two.
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Old 09-11-2012, 10:34 PM
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thanks

Thanks for the info. I will try that this week end.
Cheers.
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Old 09-12-2012, 11:10 AM
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you already know that it's time to look for a 351 cleveland
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