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Mr. Gasket high-performance thermostats are designed to resist large variations in coolant pressures that can occur at high rpms. Under these conditions, coolant temperature and pressure fight for control of the thermostat, keeping it from opening at its designed temperature. These balanced high-performance thermostats feature brass-and-copper construction, and open at the right temperature regardless of engine rpm.
The thermostat works good. Price is good. The low temp. and high flow is what I needed in my 496 ci stroker big block, 575 hp. When it's 100 degrees outside a 15 to 20 degree cooler engine buffer zone is nice to have.