Housing replacement kit for V6 and V8 MerCruisers. The engines cooling system components take a beating. Constantly heat cycled and exposed to salt water and fresh water, these parts corrode at a much faster rate than other engine parts. Sierra thermostat housings are engineered to match OEM housings to ensure technicians and boaters the fit and function will be to factory specifications. Each kit includes the necessary seal to complete the installation. Mating surfaces have been CNC machined to eliminate additional preparation. For an out of the box solution to damaged or corroded thermostat housings count on Sierra. Key Features Engineered to meet or exceed OEM specifications Kit includes housing and seal required to complete installation Cast iron construction Compatible with MCM/MCI GM V6 and V8 (305, 350, 454, and 502 cu. in.) based marine engines with closed cooling systems How to find the thermostat housing you need Select your thermostat housing by locating the OEM part number in the table below. If you don't know the OEM part number, please visit ourEngine Parts Selector, where you can search by engine make, model, horsepower, serial number and year of manufacturer. ApplicationOEM Part NumberGLM13540Mallory9-42501MerCruiser Sterndrive861188A1, 808064A1, 807074A1We offer a variety of Sierra engine parts for most engine applications on the water today—including MerCruiser, OMC, Johnson/Evinrude, Volvo and more…