flathead mercury EAC engine info needed

[Merc Cruzer]

Originally Posted by rotorwrench

It's certainly correct for your 53 Merc since it has the same visual characteristics of the blocks from mid 1951 through 1953. Replacement blocks may not have been date coded. Some blocks still had hardened valve seats and some only had hardened exhaust valve seats. Late ones may have no hardened valve seats. Trucks used hardened valve seats through the end of production but cars may not have.

I had the machine shop install new hardened valve seats during the machining. Pictures are all pre-machine shop.