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.
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* Item #’s 1a through 1g are included with the manifold assembly.
Note: Riser mounts at slight angle to compensate for wider manifold design.

1.MO618-63* Manifold Assembly. Fits 250 cu.in. GM in-line six cylinder engines equipped with Mercruiser riser #’s 76351, 76325, 60426, 49964, 76771 or 60427. 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.BWF*Rear Plate. Fits MO618 series manifolds.

1d. BG* Gasket, end plate. Fits BWS and BWF and plates.

1e.MO66351 *Riser Adapter. Adapts 6325, 6351, and 6771 risers to manifold.SEE NOTE    ABOVE

1f.MO618-G **Gasket, riser adapter to manifold.

1g.CY-MG*Gasket 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. 6351 Riser, 3" exhaust outlet, 90º down angle. For use in most inboard/outboard applications. Replaces Mercruiser #’s 76351, 60426 and 49964. Use mounting kit 6371-MK.

4. 6771 Riser, 3" exhaust outlet, 0º down angle. For use in most inboard applications. Replaces Mercruiser #’s 76771 and 60427. Use mounting kit 6371-MK.

5. 6371-MK Mounting Kit, riser. Fits 6351 and 6771 risers. Includes 52076 gasket and mounting hardware.

6. 6325 Riser, low profile, 3" exhaust outlet, 90º down angle. For use in inboard/outboard applications where height is a problem. Replaces Mercruiser # 76325. Use mounting kit # 6325-MK.

7.6325-MK Mounting Kit, riser. Fits 6325 riser. Includes 52076 gasket and mounting hardware.

8. 52076 Gasket, riser. Included in 6371-MK and 6325-MK mounting kits.
 

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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.