Re: repowering 25 seafari????????
Single 250 Optimax will only get you mid 30's for speed. And you won't plane on a single engine with twin 175s.
But since twin 250 Opti's will set you back $35K with a bracket and rigging, why not just switch the sterndrive over to 315 hp. Yanmar-Mercruiser diesel/Bravo 2 for a little less money?
(I couldn't find current prices prices on Cummins-Mercruiser, nor Volvo-Penta DP sterndrive, nor BMW Marine Diesel, and no Yamaha Marine diesel stern-drive(sold only in Asia)
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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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