Complete exhaust manifold and riser set for Mercruiser small block GM V8 engines. Kit Includes: 2 Cast Iron Center Rise Exhaust Manifolds 2 4" Exhaust Elbows 2 manifold gaskets and 2 riser gaskets Mercruiser V8 305/350 Small Block Exhaust package complete with 4" Center Risers, Manifolds and Raw Water Cooled Gaskets. NOTE: Includes: (2) Sierra 18-1953 Manifolds (2) Sierra 18-1976 Risers (2) Sierra 18-0872 Manifold Gaskets (2) Sierra 18-0897 raw water cooled riser gaskets.

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