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What degree thermostat should I be using

C

chris_rohde

Contributing Member
"The enging runs cool, but may

"The enging runs cool, but maybe too cool. It runs at about a constant 160* so I would assume that may be the stat I have in there. I would think that it might run better and at least get a little better fuel economy if it ran about 175. Is this correct??? It is the 225E (Chevy 305).

Thanks!!!"
 
"You won't notice enough d

"You won't notice enough difference in economy with the 175 degree thermostat. The 160 is fine. If the motor has a carb, you may have run-on with a hotter 'stat."
 
"Chris, I have installed a 160

"Chris, I have installed a 160º in my current project, a 350 ex-AQ311. This is the standard thermostat recommended for Chevy V-8 engines in marine applications, but some go as low as 140º. The original thermostat in my engine was 190º, which I think is too high for the application and it does not allow much margin to react if something goes wrong. I intend to do sea trials in a few days to see how it goes, but I think it will run just fine."
 
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