Here in Texas Gulf Coast, my thinking went to use a 160 stat; seemed counterintuitive to use a 180 or higher. Had pinging, spent a lot of time chasing the timing. Finally, emerged from the cave (like the metaphor!), read Mopar's Big Block tome, "160 thermostats should NOT be used in other than high endurance racing vehicles. Use of 160F thermostats in vehicles other than this can cause serious engine damage." Who am I to argue with the engineers who design/build these motors. Went to 180 stat, timing was a lot easier to manage and dial in. Engine temp still the same 190-205.