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But a carbed motor with a 195° will last longer, run cleaner, get better mileage and the heater will work much better. A 180° may make a little more power that you will probably never notice. I would do a 195° unless you have a special reason to run colder (like a high performance 11:1 compression motor).
I run 180 as well, just because in the past I had cooling problems and wanted to keep it on the cool side.
My understanding though is that the hotter the engine runs (in moderation) the better it performs, combusts etc.... Hopefully someone else will chime in on this thought.
Next time I crack it open I'll probably put a 190 Tstat in, as I've solved my cooling problems with a better manual fan, and 2 independent electric pusher fans.