Re: 1978 Classic SeaCraft 20SF Will 115 perform well
A 115 will power it just fine. As a SeaCraft dealer in the 80's I rigged more 115's on the 20 than any other motor. I even rigged quite a few with 85 hp motors, and they, too, performed adequately. Finally, I have a 20' Seafari, and I have a Mercury 90 hp Optimax on it which runs well and gets over 5 mpg at cruise.
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Common Sense is learning from your mistakes. Wisdom is learning from the other guy's mistakes.
Fr. Frank says:
Jesus liked fishing, too. He even walked on water to get to the boat!
Currently without a SeaCraft 
(2) Pompano 12' fishing kayaks
'73 Cobia 18' prototype "Casting Skiff", 70hp Mercury
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