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Sierra Catalog
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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
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search by part the Part Number
with the abbreviation at the
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the parts you need and respond
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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.BWF*Rear Plate. Fits
MO618 series manifolds.
1d.
BG*
Gasket, end plate.
Fits BWS and BWF and plates.
1e.MO65538*Riser Adapter.
Adapts 5538 riser to manifold.
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.
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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