Quote:
Perhaps a 30" transom was an option back then?
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Must have been, for twin 25" shaft motors.
I know the first regular 30" shaft motors were no introduced until the '86 3.4L Mercurys. Prior to that, you had to buy an extension kit to get a 30" motor. OMC intro'd a 30" shaft the next year, in '87, and I
think it was initially available only on the V8s, but I'm not sure.
As I think about it, I remember we notched the transom on a 25' Robalo CC that had twin 115's and put on a single 25" 235 EverJohn engine back in '84.
__________________
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