i went from a 205 thermostat to a 180 because i had a overheating problem and that took care of it, and from what i understand you don't need a lower thermostat because your engine isn't getting to temperature anyway. on the other side i think i'm going to go with a 165 degree thermostat cause i'm going to add a electric fan to my jeep and set it for 190 on 180 off
p.s. I read that for every 10 degrees in engine temperature decrease is another 1/4 to 1/3 a compression ratio increase you can get with the same unleaded fuel(to a point of course) and every 8 degree decrease in intake temperature is one point decrease in octane level required for increased CR
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