The performance bulletin in the literature shows the 27 doing 43 mph with twin 2.6L OMC Sea Drives 607 lbs each. Granted your, SeaMaster is a bit different but the hull does the work and I can't imagine a huge difference.
I read somewhere they were rated at about 185 hp being crossflow evinrudes of the early to late 80s. I would think the Yammie 200s would be ample power, and be much lighter than the 250s, and probably more efficient too.
I think the Etec 200 or the Zukes would be where I'd look if I had the clams. you guys seem to have a lot of good repower shops down there with excellent deals by left coast standards. Good luck with her repower.
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