Keep your vintage cruiser in proper working order with an upgrade in the cooling department. An aged or failed thermostat can lead to overheating, accelerated engine wear, and potential internal engine damage. The Mishimoto Mercury Racing Thermostat is precision engineered to provide your vehicle with years of reliable service and optimal cooling efficiency even in the most demanding environments. Mishimoto racing thermostats promote greater cooling efficiency by significantly decreasing high engine temperatures. Once the engine is fully warmed up, the Mishimoto low-temperature racing thermostat will open at a lower temperature (180F) compared to standard thermostats (195F). This allows coolant to flow through the engine sooner, thus reducing and maintaining cooler engine temperatures. Mishimoto thermostats are digitally calibrated, utilize high-quality wax to ensure precise and consistent opening temperatures, and include a gasket for seamless, leak-free installation. This thermostat is applicable for most 1949-2007 Mercury V8, V6 and L6 engines; check the application guide for more specific fitment details. As with all our products, this racing thermostat is guaranteed by the Mishimoto Lifetime Warranty