Sierra 18-1986-2 Volvo/OMC Exhaust Manifold Replaces 3857723Replaces: OMC & Volvo; 3857723, 3847501, 3857579, 3852374-2,3852374; Mallory; 9-40902; Barr; OMC-1-914035; GLM; 51430; Sierra; 18-1986-1; Use With: Exhaust Manifold Gasket 18-2949; Mounting Kit 18-8502; Riser 18-1909-1; Exhaust Manifold Gasket 18-2902; Exhaust Manifold Gasket (Priced Per Pkg of 2) 18-2902-9; Exhaust Manifold Gasket (Priced Per Pkg of 2) 18-2949-9;