Sierra's 18-4367 Exhaust Manifold Gasket Set is designed for use with GM 153 and 181 (2.5L & 3.0L) CID engines: 120 HP and 140 HP (s/n 6229718 & Up). The set contains: (1) Sierra 18-2832-1 Manifold End Cap Gasket, (1) Sierra 18-0928-1 Manifold End Cap Gasket, (1) Sierra 18-1204-1 Exhaust Manifold Mounting Gasket, (1) Sierra 18-2833 Exhaust Elbow Gasket, (1) Sierra 18-2831 Thermostat Cover Gasket, and (1) Sierra 18-0994 Carburetor Mounting Gasket. It is interchangeable with Barr MC47-27-99777A1, GLM 39320, Mallory 9-61406, and Mercruiser Stern Drive 27-99777A1. Each Sierra product meets or exceeds the original equipment part it replaces. Fit specific, check part numbers to ensure proper fit.