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
