Re: Need old experienced Mariner I-6 Advice
If it is in good shape and not too much $$, go for it. They were good engines, but louder than v-6's of the day. The wrap around aluminum cowling does nothing to keep sound in. They are also fuel thirsty.
That said, I have a 197? something merc 115 inline 6 on a small 1976 15' Glastron. We beat the living heck out of that thing every summer. It is like the energizer bunny. It just keeps on going. WOT throttle is still in the low 50mph range.