Sierra's 18-3646 Thermostat Kit fits Ford and GM V-8 engines with standard cooling (1982 and older) and hi-performance models engines with closed cooling (1996 and older). The kit contains (1) 18-2553 Thermostat Gasket, (1) 18-2834 Thermostat Cover Gasket, (1) 18-2844 Thermostat Cover Gasket, (1) 18-2917 Thermostat Housing Gasket, and (1) 18-3551 Thermostat. It is interchangeable with GLM 13380, Mallory 9-43151, and Mercruiser Stern Drive 807252Q3, 807252T6. Each Sierra product meets or exceeds the original equipment part it replaces.
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