Re: 20' HP ratings
JWB - Keep in mind that 1970's and 1980's motors weighed a lot less than most of todays outboards. For example a New Mercury Verado 200 weighs 650lbs vs. a 1978 Merc 200 which topped the scales at a lean 340lbs. 650lbs on the stern of a 20footer will sink the boat, so try to keep the stern as light an possible (400 - 425lbs).
The 20 seacraft also starts to chinewalk at speeds above 45mph, so there is not much point in powering the boat with anything over 200hp.
I think a 150hp would be perfect match for the 20.
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