View Full Version : What degree thermostat should I be using

07-17-2006, 12:27 AM
"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).


07-17-2006, 09:48 AM
"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."

El Pescador
07-17-2006, 12:56 PM
"Chris, I have installed a 160 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 140. The original thermostat in my engine was 190, 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."