Mr. Gasket High Performance Thermostat is designed to resist large variations in coolant pressure that occur at high rpm's where coolant temperature and coolant pressure fight for control of the thermostat keeping it from opening at its designated temperature. Its opening temperature rating is 195 degree. The balanced HP thermostat features all brass and copper construction, and opens at the right temperature regardless of engine RPM. Its balanced design eliminates damaging thermostat cycling in stop-and-go situations.