Proper thermostat operation is key in getting peak performance and maximum fuel efficiency!
This marine-grade Kit will withstand the rigors of "ugly" brackish and saltwater. Thermostat Kit (part no. 18-3646) replaces O.E.M. thermostat kit no. 807252Q3.
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Sierra® Thermostat Kit for Mercruiser®230, 250, and 260 HP Engines, 1977-1987
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