Mercruiser 224 CID Exhaust Elbow Gasket | Sierra 18-0113-1Seals between the exhaust elbow & exhaust manifold on Mercruiser 165, 470, and 3. 7L marine engines with cast iron exhaust manifold. Mercruiser 224 CID Exhaust Elbow Gasket Sierra 18 0113 1 Sierra exhaust elbow gasket For Mercruiser 165, 170, 180, 190, 3. 7, 470, and 488 engines used from 1983 1989 with cast iron manifold 224 cu. in. Replaces Mercury 27 97542, 27 856705 Replaces Mallory 9 61411