Re: What year is this 1350 Mercury?
Recheck your serial number as a 1350 was not made in this serial range of numbers you posted...
I rechecked & the engine mount bracket has the serial number 2504413.
The engine block has this number 948-3886. Does that help? There are a few placards on the engine stating 1350, thunderbolt ignition, 135hp, etc...
My guess is it is a 1970 or 1971 1350.
I found serial numbers that match mine, but they show it for a 968 125hp. Perhaps my engine was mated up to a different transom mount?
Does anyone have an electrical wiring diagram on PDF?