MERCRUISER GM In-Line Six Cylinder

Osco Marine Manifolds Since 1932 OSCO Motors Co. has been in the business of providing boaters with a high quality, reasonable cost alternative to original manufacturer's equipment. All manifolds come with a 3 year warranty and DO NOT include gaskets. Order gaskets and bolts separately. We stock all OSCO manifolds and ship the same day. Please Remember we stock parts and accessories for all makes and models of marine engines and boats. These catalog pages represent just a few of the parts we stock. Use the search field on the top to search by part the Part Number with the abbreviation at the bottom of each page. If you do not find what you are looking for please fill out the info form and we will find the parts you need and respond with a quote. Click on Image or Part number below for Price
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* Item #’s 1a through 1g are included with the manifold assembly. *1.MO618-55 Manifold Assembly. Fits 250 cu.in. GM in-line six cylinder engines equipped with Mercruiser riser#’s 39920 or 55538. Includes items 1a through 1g and mounting hardware. Does not include manifold to cylinder head gasket. 1a.F68N9 Water Fitting, plastic 90º. 3/4" MPT x 1" hose barb. 1b.BWS Front Plate. Fits MO618 series manifolds. 1c.BWFRear Plate. Fits MO618 series manifolds. 1d. BG* Gasket, end plate. Fits BWS and BWF and plates. 1e.MO65538Riser Adapter. Adapts 5538 riser to manifold. 1f.MO618-G Gasket, riser adapter to manifold. 1g.CY-MGGasket for 2 barrel Rochester carburetor, studs measure, 31/4" x 17/8" on center. 2.CY6-GH Gasket,** manifold to engine cylinder head. Replaces Mercruiser # 27-46401. 3. 5538 Riser, 2-1/2" Exhaust outlet, 90º down angle. Fits early Mercruiser applications. Replaces Mercruiser#’s 39920 and 55538. Use mounting kit 5538-MK. 4. 5538-MK Mounting Kit, riser. Fits 5538 riser. Includes 5538-G gasket and mounting hardware 5. 5538-G Gasket, riser. Fits 5538 riser. Included in 5538-MK mounting kit. Replaces Mercruiser # 27-39915
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