I'm late on this one, but my two cents. My 1982 GB Classic 42 has been repowered with a naturally aspirated single John Deere 6086. She hums along at 7.5 knots burning 1.5 gph fuel, at 8 - 8.5 knots I'll burn about 2 gph. I love my powerhouse, I found I had enough torgue to get me out of some crazy currents in tight spots heading up the inside passage last summer. She is not underpowered thats for sure.
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