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[rjparksjr]

Certainly interesting. Hard to believe that after all these years the old Mercs have such a knowledgeable group of devoted followers that truly love them. All the best to you all.

Thank you for all the input on figuring this out!

Kindest Regards,

Bob...

[rjparksjr]

Dean, Yes it is a 1956 block.

I have some more information from a very knowledgeable 82 year old ex- Mercury Racer / Collector that called me last night. When I explained to him the serial number dilemma (and before I could finish), he said, " Bob, I know exactly what it is."...

[rjparksjr]

First of all, thank you for your input 25XS.

I checked the block by the #2 cylinder as you suggested. There is a serial number 1023440 works out to a 1956 Mark 30. But wait! There is more!... reached out to Mercury Marine Performance. They indicated the X that is stamped in the block is...