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This "standard" 160 degree thermostat was mated to the Water Restrictor Plate in a 1972 Mustang Mach 1 with a 351 Cleveland. It's been on long drives. In 2017, the Mustang was DRIVEN 1000 miles round trip to hot Fabulous Fords Forever in sunny, hot 100+ degree southern California. Absolutely no problems with overheating, ran cool, even with the standard factory belt driven fan, an after-market A/C unit, and original radiator. Recently in 2019, the Mustang was 1 of 1000s of show cars on display at SEMA Las Vegas. After 3 full hours of stop & go traffic to get out of the exhibit, the 351 Cleveland motor never overheated and always ran cool.