Dropping to a 160 degree thermostat gives an engine more headroom before it starts pulling timing or detonating, which matters on a hot lap or a long pull. The catch is that a cheap unit will not hold that setting once coolant pressure rises, which is exactly what this one is built to handle.

Mr. Gasket 4363 High Performance Thermostat Features:

• Fits GM, Ford and AMC applications, Chrysler Slant 6, and 1979-1989 Mopar 318 and 360 V8 engines.
• 160 degree opening temperature.
• Designed to resist large variations of coolant pressure at high rpm.
• Opens fully at the correct temperature consistently regardless of engine rpm.
• High flow design suits engines operated at sustained high rpm.
• Sold individually.