Restrictor washer instead of t-stat

[Tom's36coupe]

Have been running washer's with 1 inch diameter hole in them instead of thermostats. I know most people like to run thermostats but only drive my car in the summer so don't really care about warming up. Just like the idea that water is circulating all of the time. Anybody else doing the same, how about hole size too. My motor runs at 180 going down the road in 75-80 degree weather, only gets hotter when sitting in traffic then the fan turns on.