Mercruiser Cylinder Head Assemblies

Mercury Marine 938-883490 1 replacement parts
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Part # 18-4485
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Replaces 5.7L V-8 GM 1987-95 w/Press in rocker arm studs w/ 12 intake manifold mounting bolts- (4 inside intake manifold bolts at 23 degrees), center mount valve covers
Mercury Marine 938-883297 1 replacement parts
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Part # 18-4486
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Replaces 5.7L V-8 GM Vortec 1996 & up w/Press in rocker arm studs w/ 8 intake manifold mounting bolts, composite valve cover
Mercury Marine 936-5544 replacement parts
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Part # 18-4489
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Replaces 2.5L/3.0L I4 GM 1968-95 (non MerCruiser LX models) 1968-95
Mercury Marine 938-824147 replacement parts
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Part # 18-4491
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Replaces 4.3L VortecV-6 GM w/Screw in rocker arm studs(non-adjustable valve train), 8 intake manifold mounting bolts, center mount valve cover NOTE: not for use with engines using factory roller rocker arms
Mercury Marine 949-5798 replacement parts
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Part # 18-4495
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1986 & up 5.0L Ford w/D-shape 58 cc combustion chamber
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Part # 18-4501
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Fits: 5.0L Vortec
(Out Of Stock)
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Part # 18-4502
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Fits: 5.7, 6.2 GM Small Block V-8
Aluminum cylinder heads sold in pairs only. This utilizes a 185cc intake runner/ 62cc exhaust runner and 2.02/1.60 stainless valves placed in a 72cc combustion chamber.
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Part # 18-4503
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  • Cast Iron cylinder heads sold in pairs only
  • OE look
  • Corrosion resistance heavy-duty cast iron castings suitable for saltwater usage
 
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Part # 18-4504
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  • Aluminum cylinder heads sold in pairs only or 454 & 502 cu.In big-block GM applications.
  • Custom engraved with Sierra High-Performance logo
  • 320 cc intake runner/119cc exhaust runner
  • 2.25 intake/1.88 exhaust stainless steel valves
  • 5 angle valve seat cut
  • Up to 65HP increase over OE cylinder heads
  • Suitable for use on Mark IV, Gen V, & Gen VI GM blocks. Must use correct corresponding head gaskets
  • Std. BBC 7/16" rocker studs and 3/8" diameter pushrod guideplates
  • Rectangle intake ports
  • Use on factory non-adjustable valvetrain applications require adjustable rocker arm assemblies such as Sierra's 18-4507
  • Use Sierra 18-4506 guide plates to utilize factory 5/16" pushrods
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Part # 18-4508 ValueShip™ Eligible
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High performance head bolt kit-small block GM
Sierra
Cylinder head assemblies from Sierra for Mercruiser Engines.
Q:
We are looking for a cylinder head for a 1977 OMC 140hp 4 cylinder engine. can you supply .. thx?
A:
We will need the engine model number to see if we have a cross reference at all.
Q:
Will this replace cylinder head with casting # 2776854?
A:
Yes, this Sierra cylinder cross references with this part number/information.
Q:
Will this replace part number 276703?
A:
We cannot cross reference by that number. We will need your engine information including serial number to match up.
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