GLM Exhaust Manifold. Fits Mercruiser V8 big block. Refer to manufacturer recommendations and guidelines for proper fit/installation information. Features of GLM Exhaust Manifold Made from quality materials Fits Mercruiser components Replacement exhaust manifold Refer to manufacturer recommendations for proper installation/fit information Designed for use in marine environments Package Contents: GLM Exhaust Manifold GLM 51220: 51220 Exhaust Manifold