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I have a pontiac 400 BB I was wondering what is the best temperature to operate the motor at......? I had a 180 thermostat and when it was cold out it runs like 165 too cold.......i went to a 195 and it runs like 205....what is the best temp for my motor or any motor for that matter.....thanks in advance
 

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195 isn't too bad at all. When you start peaking 205-210 thats getting a little hot but 190-195 is target area for most cars i believe. I run mine at around 185 or so and it seems to work really well.
 

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Since you are in "Cheeseland"...(Wisconsin), I would leave the 195 in for the winter. You will need the heat. Put the 180 back in, in the spring.
 
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