27-864549A02 Dry Joint Block Off Elbow Gasket for MerCruiser V6 & V8
27-864549A02 Dry Joint Block Off Elbow Gasket for MerCruiser V6 & V8 is backordered and will ship as soon as it is back in stock.
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27-864549A02 Dry Joint Block Off Elbow Gasket for MerCruiser V6 &am...
27-864549A02 Dry Joint Block Off Elbow Gasket for MerCruiser V6 & V8 is backordered and will ship as soon as it is back in stock.
SERDAMARINE / MARINE EXHAUST PARTS
Dry Joint Exhaust Elbow Block Off Gasket for MerCruiser GM V6 and Small Block V8 Closed Cooling Systems
This aftermarket Dry Joint exhaust elbow gasket features a Block Off configuration for closed cooling setups and corresponds to MerCruiser reference 27-864549A02. It fits MerCruiser GM V6 and Small Block V8 engines (4.3L, 5.0L, 5.7L, and 6.2L) from 2002 and up utilizing Dry Joint closed manifold and riser assemblies, including 2002–2004 7° and 2005–2010 14° Dry Joint elbow designs.
Configuration & Specifications
| Joint Design | Dry Joint |
|---|---|
| Flow Configuration | Block Off |
| Cooling Configuration | Closed Cooling (utilizing Dry Joint closed manifold and riser) |
| Associated Elbow Angles by Year | 7° Dry Joint elbow design (2002–2004); 14° Dry Joint elbow design (2005–2010) |
Engine Applications
This gasket is configured for MerCruiser Stern / Out Drive GM V6 and Small Block V8 engines equipped with Dry Joint exhaust components and closed cooling requiring a Block Off passage. Verify that your cooling layout requires a Block Off gasket rather than a Full Flow or Restrictor passage before installation.
- MerCruiser 4.3L, 5.0L, 5.7L, 6.2L — Utilizes Dry Joint closed manifold and riser with Closed Cooling (Block Off). Fits when specified
- MerCruiser V6 & V8 — Year: 2002-Up. Joint: Dry Joint with Block Off (Closed Cooling). Fits when specified
- MerCruiser GM V6 & V8 S.B. (Small Block) — Year: 2002–2004. Joint: Dry Joint. Associated Elbow Design Angle: 7°. Flow Configuration: Block Off (Closed Cooling). Fits when specified
- MerCruiser GM V6 & V8 S.B. (Small Block) — Year: 2005–2010. Joint: Dry Joint. Associated Elbow Design Angle: 14°. Flow Configuration: Block Off (Closed Cooling). Fits when specified
- MerCruiser GM V6 & V8 S.B. (Small Block) — Joint: Dry Joint. Flow Configuration: Block Off (Closed Cooling). Fits when specified
Reference Numbers
These part numbers are provided for identification reference only and do not independently establish direct interchangeability or manufacturer identity.
| MerCruiser OEM References | 27-864549A02, 864549A02, 27-864549A1 |
|---|---|
| Sierra Aftermarket Reference | 18-0720 |
| GLM Aftermarket Reference | 37920 |
Supplied Parts
- Dry Joint exhaust elbow Block Off gasket
Service & Installation Notes
General service guidance only. Use the service manual for your exact engine and exhaust configuration.
- Ensure the engine is completely shut down, cooled, and secured against accidental starting before servicing the exhaust system.
- Support the exhaust elbow during removal and installation, and clean both Dry Joint mating surfaces thoroughly without gouging or damaging the sealing areas.
- Compare the new Block Off gasket against the removed gasket and the mating surfaces on your closed manifold and riser to verify port alignment and coolant passage blocking requirements.
- After assembly, inspect the joint during initial operation and stop the engine immediately if any exhaust or coolant leakage or abnormal temperature is observed.
The Serdamarine Approach
Exhaust parts need a configuration match. Serdamarine focuses on marine exhaust manifolds and their related service parts. Application details, connection requirements and public reference numbers are presented together to support part selection.
Questions Before Replacement
What do the 7° and 14° specifications mean for this gasket?
The 7° (2002–2004) and 14° (2005–2010) figures describe the angle of the mating Dry Joint exhaust elbow on MerCruiser GM V6 and Small Block V8 engines rather than an angle built into the gasket body itself.
When is a Block Off Dry Joint gasket used?
This Block Off gasket is used on MerCruiser 4.3L, 5.0L, 5.7L, and 6.2L GM V6 and Small Block V8 engines (2002-Up) equipped with a closed cooling system utilizing a Dry Joint closed manifold and riser where coolant flow between the manifold and elbow is blocked at the joint.
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