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Product DescriptionThermostat w/Gasket - Direct replacement manifolds with end riser for 800 series, 5.0L and 5.7L engines. '78: 185-225 hp; '81: 200, 230, 260 hp; '79: 185-230, 260 hp; '82-'88: 5.0L, 5.7L; '80: 185-260 hp. Thermostat for use with all models listed except '81-'84 4 cyl.