Welcome to the site!! Sounds like you're leaning towards a 3.7. They're good motors, and their problems are easily fixed. My 170/470 gets really good gas milage and has plenty of power. I've topped out at 42mph with 2 adults and 3 kids, trimmed up and tached out. I love my 170!! Good luck with yours!
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77 V20 cuddy with 170 I/O Mercruiser
72 16ft. Carolina w/a 25hp Evinrude
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