As you have a strong interest in these I’ll
share what I have learned from the ones I’ve
had as well as what others have shared with me.
Your motor is a 1936 as the water tube is inside
the exhaust. Only year they did that. We’ve also
discussed the deference in the 36 stands and tiller.
Originally the had intended the have the water
enter the pump through the pump body. This
didn’t provide enough water for cooling so they
put two holes in front of the gear case to increase
the supply of water. I don’t know if any motors
were sold before the change or they discovered
it in testing. The pump castings for the early
design were still used. They just didn’t machine
the hole for the water. The early castings have
this flat spot where the water access hole would
have been.
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A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.