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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.
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1.MC553-SB
Thermostat base. Fits
engines with log style
manifolds. Fits small block GM,
V8 305 - 350 cu.in.Replaces
Mercruiser # 78984.
2.MC553-BB
Thermostat base. Fits
engines with log style
manifolds. Fits big block GM 454
cu.in. Replaces Mercruiser
# 78985.
3.MC55-TSB
Top Cover. Fits small
block thermostat housings.
Replaces Mercruiser # 47441.
4.MC55-TBB
Top Cover. Fits big
block thermostat housings.
Replaces Mercruiser # 47442.
5.143-DEG
Thermostat element,
143º for raw water cooling.
Replaces Mercruiser # 59137.
6.48818
Gasket, top cover to
base for log style manifolds.
Replaces Mercruiser # 27-48818.
Use with MC553-SB or
MC553-BB thermostat
bases.
1.
MC552-SB
Thermostat base.
Fits engines with center riser
style manifolds. Fits small
block GM, V6 and V8 305 - 350
cu.in. Replaces
Mercruiser # 87290. Uses
original Tee fitting.
2.
MC552-BB
Thermostat base. Fits
engines with center riser style
manifolds. Fits big block GM 454
cu.in. Replaces
Mercruiser # 90736. Uses
original Tee fitting
3.MC55-TSB
Top Cover. Fits small
block thermostat housings.
Replaces Mercruiser # 47441.
4.MC55-TBB
Top Cover. Fits big
block thermostat housings.
Replaces Mercruiser # 47442.
5.
41812
Gasket, top cover
to base for center riser style
manifolds. Replaces Mercruiser #
27-41812. Use with
MC552-SB or MC552-BB
thermostat bases
6.47508
Sleeve, thermostat
element. Replaces mercruiser #
23-47508. Use with MC552-SB or
MC552-BB
thermostat bases.
7.47510
Gasket, sleeve to
thermostat element. Replaces
Mercruiser #27-47510. Use with
MC552-SB or
MC552-BB thermostat
bases.
8.143-DEG
Thermostat element,
143º for raw water cooling.
Replaces Mercruiser # 59137.
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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 right 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
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the parts you need and respond
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