18 seacraft power

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If you have the original floor (height) in the 18', along with the 20" transom, I'd highly recommend against either of the Suzuki engines you listed. Buy the lightest weight engine you can find.

When I had my '77 18', I had two different engines on it over the years, both well under 400#s and can't imagine putting a Suzy 115/140 on there. I'm sure someone has done it but it's far from ideal.