I just changed my thermostat in my SPF from 160 to 180 to put more heat in the engine. On the highway the BB runs at 180. In town it goes to 200. I think the shroudding on the rad is excellent and that is why it cools so efficiently. I do have the
oil cooler hooked up but it has a Canton 215 thermostat on it. I believe it has only opened a few times. I considered the 195 thermostat but the fan is designed to come on at about 195, so I did not want to run the fan all the time. The only other change I made was to change the alternator to a 140 watt unit because the underdrive pulley set on the motorvdid not allow the 77 watt stock unit to spin up sufficiently to yield enough power.