PCM Exhaust Manifold 305 350 GM R028009: Fits: PCM OEM 305 and 350 (either side) also PCM 330 Excaliber engines Decal & Gaskets Not Included Innovated first by Pleasurecraft Marine, the center pyramidal Exhaust Manifold is now an industry standard. Its unique design allows the hot exhaust gases to naturally flow up the reversible riser where it is then directed to the exhaust outlets. This compact, free-breathing design allows for installation at all standard angles without modification and prevents excessive back pressures. Available in high gloss black cast iron, ready to run! Approx weight 39 lbs.