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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
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 the Picture or Part
Number Below to Check price |
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1.MO4-HOK
Adapter Plate Kit.
Converts large intake port
manifolds to small intake port
cylinder heads. Includes
MO4-HO adapter, MO4-GH gasket,
MO4-HO-GH gasket and mounting
hardware for Mercruiser
manifolds.
2.MO4-GH
Gasket, manifold to
adapter
3.MO4-HO
Adapter Plate. Can be
used in other applications such
as Marine Power, OMC, Etc.
4.MO4-HO-GH
Gasket, adapter to
cylinder head. New style high
output head with small intake
ports.

Note: Both
elbow/reservoirs are made of
cast iron like the original
Mercruiser parts.
Osco does not make the 3.7L or
3.7LX exhaust manifolds.
1.
0879
Elbow/Reservoir.
Fits Mercruiser cast iron
manifold # 99908. Replaces
Mercruiser # 90880.Cap included.
Use mounting kit # 0879-MK.
Fitting not included.
2.
0879-MK
Mounting Kit,
elbow/reservoir. Fits 0879
elbow/reservoir. Includes 0879-G
gasket and mounting
hardware.
3.
0879-G
Gasket,
elbow/reservoir. Fits 0879
elbow/reservoir. Included in
0879-MK mounting kit.
Replaces Mercruiser #
27-97542.
4.
8561
Elbow/Reservoir. Fits
Mercruiser aluminum manifold #
93174. Replaces Mercruiser #
98561.
Cap included. Use mounting kit
8561-MK. Fitting not included.
5.
8561-MK
Mounting Kit,
elbow/reservoir. Fits 8561
elbow/reservoir. Includes 8561-G
gasket and mounting
hardware.
6.8561-G
Gasket,
elbow/reservoir. Fits 8561
elbow/reservoir. Included in
8561-MK mounting kit.
Replaces Mercruiser # 27-18272. |
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