EMP 57-57520 MerCruiser V8 GM Small Block Exhaust ManifoldThis exhaust manifold is designed for use with MerCruiser cooling systems and meets OEM specifications.Exhaust Manifold Application:Fits most MerCruiser (GM) small blocks with center riserInterchangeable: BARR Marine; MC-1-87114; GLM; 51230; Mercury/MerCruiser; 87114A19; Sierra; 18-1953-2;