Sierra 18-1998-1 Exhaust Manifold - Port Starboard for Ford V8 Engines Fits Port and Starboard Sides. Universal Center Riser Manifold. Fits Crusader 302 and 351 CID Engines Interceptor 221, 260 and 289 CID Engines Commander, Mercury, OMC, Palmer, Pleasurecraft Waukesha Comes with 18-4363 Mounting Package Use 18-0603 Exhaust Manifold Gasket Set Contains Exhaust Elbow Gasket 18-2854-1 Exhaust Manifold Gasket 18-0183-1 Pipe Plug 18-4258 Use With Exhaust Manifold Gasket 18-0183 Exhaust Manifold Ga