Exhaust Elbow Gasket – Fits MerCruiser V6 and V8 (Replaces 27-863726)
Exhaust Elbow Gasket – Fits MerCruiser V6 and V8 (Replaces 27-863726) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
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Exhaust Elbow Gasket – Fits MerCruiser V6 and V8 (Replaces 27-863726)
Product Details
This high-quality Exhaust Elbow Gasket – Fits MerCruiser V6 and V8 Stern Drives (Replaces 27-863726) creates a reliable seal between the exhaust manifold and the riser or elbow. It is specifically designed for MerCruiser 4.3L (V6), 5.0L, 5.7L, 6.2L, 7.4L, and 8.2L (V8) 4-stroke engines from 1998–2001 that are equipped with center rise outlet exhaust manifolds.
This part provides a direct interchange for MerCruiser 27-863726, 27-860232, 27-818832, 27-87105, 27-871051; Sierra 18-2849-1; GLM 32080; Osco 8503-GO; and Mallory Marine 9-61414.
- Installs between the exhaust manifold and the corresponding riser/elbow.
- Engineered for standard cooling systems using a full-flow, open-port design.
- Constructed from durable graphite composite for a long-lasting, leak-free seal.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| MerCruiser | 27-863726 |
| MerCruiser | 27-860232 |
| MerCruiser | 27-818832 |
| MerCruiser | 27-87105 |
| MerCruiser | 27-871051 |
| Sierra | 18-2849-1 |
| GLM | 32080 |
| Osco | 8503-GO |
| Mallory Marine | 9-61414 |
| Barr | MC47-27-87105 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For MerCruiser models, it is crucial to verify the serial number range and engine GM block size (e.g., 262/V6, 350/V8) to ensure correct gasket selection.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| MerCruiser | 262 Mag EFI (Gen+) | V6 | 4-Stroke | 1996–1997 | 27-863726 | Serial Range: 0F803800-0K999999 |
| MerCruiser | 300 | 350/V8 | 4-Stroke | 1985–1986 | 27-863726 | Serial Range: 6668677-0B430367 |
| MerCruiser | 350 Mag Alpha EFI | 350/V8 | 4-Stroke | 1996–1997 | 27-863726 | Serial Range: 0F800300-0K999999 |
| MerCruiser | 350 Mag Bravo MPI (Gen+) | 350/V8 | 4-Stroke | 1996–1997 | 27-863726 | Serial Range: 0F602000-0K999999 |
| MerCruiser | 350 Mag Bravo MPI | 350/V8 | 4-Stroke | 1995 | 27-863726 | Serial Range: 0F415189-0F601999 |
| MerCruiser | 350 Mag EFI Ski (Gen+) | 350/V8 | 4-Stroke | 1996–1997 | 27-863726 | Serial Range: 0F820707-0K999999 |
| MerCruiser | 350 Mag EFI Ski | 350/V8 | 4-Stroke | 1994–1996 | 27-863726 | Serial Range: 0F215561-0F820706 |
| MerCruiser | 350 Mag Horizon MIE | 350/V8 | 4-Stroke | 1999–2001 | 27-863726 | Serial Range: 0L304700 & Up |
| MerCruiser | 350 Mag MPI Horizon | 350/V8 | 4-Stroke | 2001 | 27-863726 | Serial Range: 0M300000 & Up |
| MerCruiser | 350 Mag MPI MIE | 350/V8 | 4-Stroke | 1999–2001 | 27-863726 | Serial Range: 0L304500-0M299999 |
| MerCruiser | 370 TRS | 454/V8 | 4-Stroke | 1985–1987 | 27-863726 | Serial Range: 6721528-0B714586 |
| MerCruiser | 377 Scorpion MCM | 377/V8 | 4-Stroke | 2000–2001 | 27-863726 | Serial Range: 0L416146 & Up |
| MerCruiser | 4.3L (Gen+) | 262/V6 | 4-Stroke | 1998–2001 | 27-863726 | Serial Range: 0L010044 & Up |
| MerCruiser | 4.3L EFI (Gen+) | 262/V6 | 4-Stroke | 1998–2001 | 27-863726 | Serial Range: 0L012009 & Up |
| MerCruiser | 4.3LH (Gen+) | 262/V6 | 4-Stroke | 1998–2001 | 27-863726 | Serial Range: 0L010044 & Up |
| MerCruiser | 4.3LX (Gen+) (2bbl.) | 262/V6 | 4-Stroke | 1996–2001 | 27-863726 | Serial Range: 0F803800-0K999999 |
| MerCruiser | 4.3LXH (Gen+) | 262/V6 | 4-Stroke | 1996–1997 | 27-863726 | Serial Range: 0F803814-0K999999 |
| MerCruiser | 5.0L, 5.7L Models | V8 | 4-Stroke | 1998–2001 | 27-863726 | Center rise outlet exhaust manifolds |
| MerCruiser | 7.4L, 8.2L Models | V8 | 4-Stroke | 1998–2001 | 27-863726 | Center rise outlet exhaust manifolds |
Technical Specs
- Product Type
- Exhaust Elbow Gasket
- Installation
- Between exhaust manifold and riser/elbow
- Material
- Graphite
- Design
- Full-flow, 4-slot gasket
- Application
- Standard cooling systems
- Usage
- Center rise outlet exhaust manifolds
- Dimensions
- Approximately 110 mm x 103 mm (4.33" x 4.05")
- Weight
- 0.08 kg (2.89 oz)
- Other Technical Attributes
- Completely open design for Full Flow engines only
What’s in the Box
- 1 x Exhaust Elbow Gasket (Replaces 27-863726)
Installation Notes
- Disconnect the battery and close the fuel and water seacocks.
- Drain the coolant from the exhaust manifold to a level below the riser joint.
- Carefully disconnect any hoses or sensors attached to the exhaust riser/elbow.
- Remove the mounting bolts securing the riser to the manifold. Keep track of their order and condition.
- Gently pry the riser off the manifold. Avoid using excessive force that could damage the mating surfaces.
- Remove the old gasket and thoroughly clean both the manifold and riser mating surfaces. Ensure they are free of old gasket material, rust, and debris.
- Inspect both surfaces for pitting or warping; resurface or replace if damage is found.
- Position the new gasket, ensuring it aligns correctly with the bolt holes and water passages.
- Reinstall the riser and tighten the mounting bolts to the manufacturer-specified torque in the correct sequence.
- Reconnect all hoses and sensors, open the water seacock, and refill the coolant if necessary.
- Reconnect the battery, start the engine, and carefully check for any exhaust or water leaks around the new gasket.
Troubleshooting & FAQ
How do I know if this gasket fits my engine?
This gasket is designed for MerCruiser V6 and V8 engines (1998–2001) with center rise manifolds. The most reliable way to confirm fitment is to check your engine's serial number against the ranges listed in the compatibility table and verify the OEM part number of your existing gasket.
What are the signs of a failing exhaust elbow gasket?
Common symptoms include water leaking externally from the joint between the manifold and riser, water entering the engine cylinders (which can cause catastrophic failure), engine overheating, or a noticeable drop in performance.
Is this a "full flow" or "restricted" gasket?
This is a completely open, full-flow gasket. It is crucial to use the correct type for your engine's cooling system. Using the wrong gasket (e.g., a restricted gasket on a full-flow system) can lead to engine overheating.
Can I reuse my old gasket?
No. Exhaust gaskets are single-use components. They compress and conform to the mating surfaces to create a seal. Reusing one will almost certainly result in leaks.
What is the recommended replacement interval?
Exhaust manifolds and risers in raw water-cooled engines typically have a service life of 3–7 years, depending on usage and water conditions (saltwater vs. freshwater). It is best practice to replace the gaskets whenever the risers or manifolds are removed for inspection or replacement.
Why is the material graphite?
Graphite composite is used for its excellent thermal stability and ability to withstand the high temperatures of the exhaust system. It also conforms well to surface imperfections, ensuring a tight seal against both hot exhaust gases and cooling water.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost?
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns?
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
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