Re: Motor Length / Transom Length
The factory twin setup on the early 80's SC was a 25" transom, and twin 20" shaft length motors. I just sold a '74 Tsunami with a 25" transom (actually 26 1/2") that came with twin 140 hp 20" Mercury motors new, and was later re-rigged with a single 225 Johnson with 25" shaft.
In 1984, I rigged a Seavette with twin 235 Evinrudes, and we used Second Effort prepped 20" shaft motors. WFO was 77 mph.
As far as I know, the pre-'88 SeaCrafts were not available with 30" transoms.
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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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