Technical Merc Flathead

I have read threw several post on identifying Flatties but can't find the answer to my question. If I missed it I apologize in advance for starting another thread. My question is this.... Can you tell if a 49-53 flathead crank is a ford or the 4" merc if it's not in a motor? Like by Casting marks, measurements, etc thank you for your time

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Perfect!!! Ty

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Also, the "clean-out" plugs on a merc crank are about 5/8" where as the Ford crank plugs are 3/8"

 

^^^this. Probably the easiest way to tell

 

Don't be fooled by the size of the clean-out plugs. There are Merc cranks with 3/8 clean-out plugs. Post your question on Fordbarn. There is a wealth of flathead info on that sight.

 

Good info right here

http://www.jalopyjournal.com/forum/threads/identifying-a-merc-crank.11215/