I use to own a 1990 Merc 90 hp, and they told me at the time that Merc made there motors by the lot, so my 1990 was just a year off my friends 1089 thats why they wanted the serial number when ordering parts. As they sold it as a 89,90,91 and so on till that lot was gone.
Use to be a number stamped into the freeze plugs on top of motor, you can use that to find out what year also/
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1986 V20 
Old Fishermen never die, we just SMELL that way!!
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