340 coolant temperature

.............put in a 195 t-stat........the coolant is no staying in the rad long enough to be cooled by the air flow.........kim.....

this is true and like old kimmer said put a 195 t stat in to keep the coolant in the rad longer if all it goes to is 220 max motor on
A 192* thermostat isn't going to flow any different than a 160* will. In fact a 160* thermostat will have the coolant flowing throught the radiator for longer intervals than the 192*. Both thermostats will open the same amount, just one will stay open longer.