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Old 12-15-2017, 02:58 PM   #2
51 MERC-CT
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Join Date: May 2010
Location: East Hartford, Ct
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Default Re: How To I.D. a Merc Flathead

The main thing that makes it a Mercury engine is the crankshaft stroke
( 4 inches )
This would have to be measured.
Most likely had no engine numbers as the US did not have any.
Don't waste time looking for one.
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