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Sierra Marine Exhaust Manifold OMC Sm. Block 18-1903

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Sierra Marine Exhaust Manifold OMC Sm. Block 18-1903

Sierra Marine Exhaust Manifold

Port Side, Fits most GM V8 small blocks with end riser

Manufacturer’s Part Number: 18-1903

Replaces OMC 912442/0912442

Item Condition: New, old stock inventory item. NOS means there may be signs of age from shelf life. All NOS are sold in uninstalled, working condition. Most parts have been removed from original packaging for picture details.

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