GM Small Block Exhaust Manifold | Volvo Penta 3847501GM Small Block Exhaust Manifold Volvo Penta 3847501 OEM Volvo Penta center rise exhaust manifold for GM 5. 0L & 5. 7L marine engines. Volvo Penta center rise exhaust manifold For Volvo Penta GM 5. 0L and 5. 7L marine engines with center rise exhaust manifolds Interchangeable between port and starboard side Includes drain plug assembly and 90 degree hose connector Does not include gaskets Heavy duty cast iron Painted black Original Volvo Penta Replaces