For sale is a brand new in the box (old stock) Osco 9011 Exhaust Manifold for Mercruiser applications. It is a center riser Manifold that was used on GM Big Block Engines From 1983 & up.

Replaces: Mercury Quicksilver #s: 807078A6, 89011A8; Barr # MC-1-89011; GLM # 51240; Sierra # 18-1957-1; Mallory # 9-40506

This manifold WILL NOT FIT Dry Joint Exhaust Systems

NOT INCLUDED: It uses Riser Osco # 8503A for the 3.0", and Osco # 4354 for the 4.0". Also, the mounting kit is Osco # 9011-MK.
GM 454 7.4L, 502 8.2L V8GM 454 7.4L 502 8.2L V8

We have included the part number with this listing, so please do your research to insure it will fit your application. Please see our other eBay listings or visit our eBay store for additional parts or other accessories for your boating needs.

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