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No you can not but you can use a long shaft on a 16 inch transom
long shaft 28pounds, short shaft 27 pounds
The most common shaft length for engines in the 90 hp range is 20 in., refered to as a long shaft. They also come in 25 in., extra long, and for special applications, 15 in. refered to as a short shaft.
20 inches or 508mm
Vans and trucks are long shaft. Cars are short shaft.
Long shaft
short shaft
By measuring the exhaust housing, between the powerhead, and where the gearcase bolts on. A shortshaft engine will have an exhaust housing length of approximately 15 in. The longshaft engine will measure 20 in.
553kg
The Johnson model JW-10, 3 hp, manufactured from 1952 - 1954, came in both short, and longshaft models. A measurement of the exhaust housing will identify which model you have.
That would be a short shaft.