I have what i think is a 1985 johnson 140 HP motor. The guy tells me the powerhead is a 91 or a 90 but originally was a 85.
The head stamping is 328624-4 on the port and 328624-3 on the starboard.
If one looks on ebay there are quite a few evinrude and johnson heads that appear to work for a 140 but not the same casting. Is there somewhere that shows if these parts are interchangeable with part numbers?