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.
Click on Images or Part Numbers below for Price

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1.MO618-01* Manifold Assembly Fits 250 cu.in. GM in-line six cylinder engines equipped with OMC riser #’s 980020 or 980188. For use with the 0188 riser. Includes items 1a through 1h 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.MO60188 *Riser Adapter. Adapts 0188 riser to manifold.

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

1g. MO601 Throttle Linkage Adapter, to be used with existing OMC carburetor linkage. Included with MO618-01.

1H.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 OMC # 907932

3. 0188 Riser, 3-3/8" outlet, 90º down angle. Replaces OMC #’s 980020 and 980188. Use mounting kit # 0188-MK.

4. 0188-MK Mounting Kit, fits riser 0188. Includes 0188-G gasket and mounting hardware to bolt riser to adapter.

5. 0188-G Gasket, riser. Included in 0188-MK mounting kit. Replaces OMC # 908013.
 

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