You guys may want to be careful of which cars you suggest doing this to. All 2000 and newer Bonneville’* will set a trouble code and turn a check engine light on if the temp does not reach 176 F within the first few miles of driving. You’re pushing it pretty close to setting a light with a 180 F stat. Personally, I would not suggest anything other than 195.
While it is true that the newer models like mine have a trouble code for detecting faulty T-stats. (Engine failed to reach operating temperature). Yes I used to set that code often but only when I had drilled large 1/8" holes in the stat to delay warm up. The normal 180 stat will not set it off.
Then I added an E-stat from ZZP to trick the computer into thinking the engine was warmer than it was. That worked great, so I could run with the drilled 160 F Stat all the time.
Now I have disabled the computer code and set the fans for the 160 stat.
The engine is very happy and nice and cool.
Best mileage I have even gotten with this car.