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If you have a properly fuctioning 185 thermostat, the temp should be 185 minimum. As younggun said, verify the temp with a known good gauge and sender or better yet an infrared sensor.

What temperature are you trying to achieve? An engine that runs 5* above the rated opening point of the thermostat is not running hot. It's entirely possible that a thermostat rated at 180* might not actually open fully until 185*. Having the engine temp rise 10* after 15 minutes of idling is...

Boy have you ever stepped in it; I guarantee that everyone who replies to this will have a different opinion, including those who say no thermostat at all. Prior to the "Lean-burn" 80s and the advent of EFI, most factory applications used a 180 for best driveability and quick warm-up. IMO this...