160 Degree Thermostat Kit | Sierra 18-3652 160 degree thermostat kit used on Mercruiser model 470 fresh water cooled marine engines. Fits Mercruiser 470 fresh water cooled engines with serial number range 4208730 to 6218036 Kit includes 18-3552 160 degree thermostat, 18-2555 cover gasket and 18-3552 cover gasket