Mercruiser Manifold 18-1957-1
Mercruiser Manifold 18-1957-1 Replaces Mercruiser 89011A8, Mercruiser 87078A6, Marine Power 0991-1000
Will fit either side.\
Fits most Mercruiser (GM) V-8 big blocks with center riser.
Use with Exhaust Manifold Gasket 18-0418
Mounting Kit 18-8532