OMC GM Small Block Exhaust Manifold | Sierra 18-1903

Port exhaust manifold fits OMC GM 5.0L & 5.7L marine engines with end riser.

OMC GM Small Block Exhaust Manifold | Sierra 18-1903

• OMC exhaust manifold
• Direct replacement manifold fits OMC GM V8 305 and 350 cu. in. small block engines with end riser exhaust manifold
• Port side
• Heavy duty cast iron
• Painted black
• Includes both gaskets and drain cap with hose clamp
• Manifold mounting kit P/N 18-8502 – sold separately
• Replaces OMC 912442
• Replaces Osco 2442