Glad you figured out what your problem was. My 170 heats up alittle when I run it really hard, makes me wonder if I might have a similar problem. If you can take some pictures of the thermostat you removed and the part numbers for both thermostats.
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77 V20 cuddy with 170 I/O Mercruiser
72 16ft. Carolina w/a 25hp Evinrude
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