27-864850A02 Dry Joint Restrictor Elbow Gasket Set for MerCruiser
27-864850A02 Dry Joint Restrictor Elbow Gasket Set for MerCruiser is backordered and will ship as soon as it is back in stock.
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27-864850A02 Dry Joint Restrictor Elbow Gasket Set for MerCruiser
27-864850A02 Dry Joint Restrictor Elbow Gasket Set for MerCruiser is backordered and will ship as soon as it is back in stock.
SERDAMARINE / MARINE EXHAUST PARTS
Dry-Joint Exhaust Elbow Restrictor Gasket Set (2 Pieces) for MerCruiser Standard Cooling
This two-piece set of restrictor-type dry joint exhaust elbow gaskets (referencing OEM 27-864850A02) fits MerCruiser GM V6 and V8 small-block engines (4.3L, 5.0L, 5.7L, and 6.2L) equipped with standard cooling and a dry joint standard manifold and riser, including 2002–2004 7° and 2005–2010 14° elbow configurations.
This is the Restrictor flow version for standard cooling systems; it is not the Full Flow (Open) or Block Off (Closed) dry joint gasket version.
Configuration & Specifications
| Joint Style | Dry Joint |
|---|---|
| Flow Configuration | Restrictor (Restricted flow — not Full Flow / Open or Block Off / Closed) |
| Cooling Configuration | Standard Cooling |
| Associated Elbow Angle & Years | 7° dry joint elbow design (2002–2004); 14° dry joint elbow design (2005–2010) |
Engine Applications
Select this gasket set by verifying the required gasket flow style (Restrictor vs. Full Flow or Block Off), cooling system, and dry joint manifold/riser configuration—not by engine displacement alone.
- MerCruiser GM V6 & V8 Small Block (2002–2004) — Dry Joint system with 7° exhaust elbow design. Requires Restrictor elbow gasket and Standard Cooling configuration. Fits when specified
- MerCruiser GM V6 & V8 Small Block (2005–2010) — Dry Joint system with 14° exhaust elbow design. Requires Restrictor elbow gasket and Standard Cooling configuration. Fits when specified
- MerCruiser 4.3L, 5.0L, 5.7L, and 6.2L (GM V6 & V8 Small Block) — Applications utilizing the Dry Joint Standard Manifold and Riser with Standard Cooling and a Restrictor-type exhaust elbow gasket. Fits when specified
Additional model-specific applications
- MerCruiser GM V8 S.B., 2002–2004, Dry Joint, 7° elbow, Standard Cooling, Restrictor gasket.
- MerCruiser GM V8 S.B., 2005–2010, Dry Joint, 14° elbow, Standard Cooling, Restrictor gasket.
Reference Numbers
The numbers below are provided for part identification and configuration comparison only. They do not alone guarantee direct interchangeability or indicate that this aftermarket set is made by an original equipment manufacturer.
Restrictor Version References (This Product Configuration)
| MerCruiser Stern / Out Drive | 864850A02, 27-864850A02, 27-864850A1 |
|---|---|
| GLM (Aftermarket Reference) | 37900 (Restrictor version) |
| Sierra (Aftermarket Reference) | 18-0722 (Restricted version) |
Other Flow Configurations & Unverified Comparison Numbers (Not This Product)
Dry joint exhaust systems use different gasket flow plates depending on the cooling layout. The numbers below identify alternative configurations or additional reference listings and are not interchangeable with the Restrictor gasket set:
| Full Flow / Open Version (For Comparison Only) | GLM 37910; Sierra 18-0721 |
|---|---|
| Block Off / Closed Version (For Comparison Only) | GLM 37920; Sierra 18-0720 |
| Other MerCruiser Reference Listings (Confirm Exact Configuration) | 27-864547A1, 27-864547A02, 864547A1, 27-864549A02, 27-864549A1, 27-99757, 27-33395 |
Supplied Parts
- 2 × Restrictor-type dry joint exhaust elbow gaskets
Service & Installation Notes
General service guidance only. Use the service manual for your exact engine and exhaust configuration.
- Ensure the engine is completely cool, shut off the ignition, and disconnect the battery to prevent accidental starting before servicing the exhaust elbow joint.
- Support the weight of the exhaust elbow/riser during removal and installation, and protect the machined dry joint mating surfaces on both the manifold and elbow from scratches or gouges.
- Compare the water passage slots on the new Restrictor gasket against the removed gasket and the engine service manual. Do not substitute a Full Flow (Open) or Block Off (Closed) gasket where a Restrictor gasket is specified.
- Follow your engine manufacturer's service manual for fastener tightening sequence, torque specifications, and post-installation leak checks. Stop operation immediately and inspect the joint if any exhaust or cooling water leak 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
How do the Restrictor, Full Flow, and Block Off dry joint gaskets differ by reference number?
This set is the Restrictor (Restricted) version, which corresponds to MerCruiser 27-864850A02 / 864850A02 / 27-864850A1, GLM 37900, and Sierra 18-0722. In contrast, the Full Flow (Open) version is identified by GLM 37910 and Sierra 18-0721, while the Block Off (Closed) version is identified by GLM 37920 and Sierra 18-0720.
Does this gasket set fit both 7° and 14° dry joint exhaust elbows?
Yes, when the engine uses a standard cooling system that calls for a Restrictor elbow gasket, this set fits MerCruiser GM V6 and V8 small-block dry joint applications with 7° elbows (2002–2004) as well as 14° elbows (2005–2010).
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