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Osco Marine Thermostat Housings for Mercruiser Engines


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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next catalog page> 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.