I'm looking for the location of the 4 digit casting number on a 1963 merc 110.9.8 hp lower end.Twin city outboards wants the number if I'm going to order one from them.I've looked on the exterior and found no numbers.Could someone look up the number? I've tried the internet and with no luck and don't have a clue to where else I could look next.Any help would be appreciated.
