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Sierra water cooled, center discharge exhaust manifold with 3/4″ NPT cooling hose connection.

Suitable for Mercruiser small block V8 283, 302, 305, 307 & 350 also suitable for some Indmar V8 GM based applications.

Includes plugs, gaskets and mounting hardware to mount riser.

Replacement for 18-1997-1, 56230, Indmar 531051 & 9-40110.

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