Exhaust Elbow Gasket – Fits MerCruiser V6 & V8 (Replaces 27-863724, 27-41813, 27-860233)
Exhaust Elbow Gasket – Fits MerCruiser V6 & V8 (Replaces 27-863724, 27-41813, 27-860233) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Exhaust Elbow Gasket – Fits MerCruiser V6 & V8 (Replaces 27-863...
Product Details
This restrictor-style exhaust elbow gasket is designed for MerCruiser V6 and V8 engines with center rise outlet exhaust manifolds, manufactured from 1981 to 1997. It provides proper sealing for standard cooling systems where water flows through the gasket openings.
It serves as a direct replacement for multiple OEM and aftermarket part numbers, including Mercury, Sierra, Barr, GLM, Mallory, and Osco equivalents.
- Installs as a direct replacement component.
- Designed for standard cooling systems with a water flow-through design.
- Restrictor-style gasket for center rise outlet exhaust manifolds.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury / MerCruiser | 27-863724 |
| Mercury / MerCruiser | 27-41813 |
| Mercury / MerCruiser | 27-860233 |
| Sierra | 18-0897 |
| Barr | MC 20 99208 |
| Barr | MC-47-27-41813 |
| GLM | 30240 |
| Mallory | 9-61413 |
| Osco | 8503-GR |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For MerCruiser Engines: This gasket is compatible with select GM V6 and V8 models produced between 1981 and 1997 using standard cooling systems.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| MerCruiser | V6 GM 4.3L | 200, 205, 230 | 4-Stroke | 1981–1997 | 27-863724 | Standard cooling |
| MerCruiser | V8 GM 5.0L | 260 | 4-Stroke | 1981–1997 | 27-863724 | Standard cooling |
| MerCruiser | V8 GM 5.7L | 260, 270 | 4-Stroke | 1981–1997 | 27-863724 | Standard cooling |
| MerCruiser | V8 GM 7.4L | 340 | 4-Stroke | 1981–1997 | 27-863724 | Standard cooling |
| MerCruiser | V8 GM 8.2L | 380, 430 | 4-Stroke | 1981–1997 | 27-863724 | Standard cooling |
Technical Specs
- Product Type
- Exhaust Elbow Gasket
- Installation
- Direct replacement
- Gasket Type
- Restrictor (Standard Cooling)
- Application
- Center Rise Outlet Exhaust Manifold
- Material
- Composite
- Flow
- Water flow-through design
- Dimensions
- Standard MerCruiser V6/V8 exhaust elbow fitting
- Warranty
- Varies by manufacturer
- Pattern
- Restrictor (partially open)
What’s in the Box
- 4 x Exhaust Elbow Gasket (Replaces 27-863724/27-41813/27-860233)
Installation Notes
- Disconnect the boat's battery and drain the engine cooling system.
- Loosen and remove the exhaust hoses connected to the exhaust elbow (riser).
- Carefully unbolt and remove the exhaust elbow from the manifold. Note the orientation of the original gasket.
- Thoroughly clean both mating surfaces on the manifold and the elbow. Ensure they are free of old gasket material, rust, and debris.
- Position the new restrictor gasket correctly onto the manifold.
- Reinstall the exhaust elbow and tighten the bolts to the manufacturer's specified torque in a crossing pattern.
- Reconnect the exhaust hoses and secure the clamps.
- Refill the cooling system, reconnect the battery, start the engine, and carefully check for any water or exhaust leaks around the gasket.
Troubleshooting & FAQ
Will this gasket fit my 1999 MerCruiser 5.0L?
No. This gasket is specifically designed for MerCruiser V6 and V8 models from 1981–1997. Engines made after 1997 typically require a different gasket style.
Is this a restrictor or an open-style gasket?
This is a restrictor-style gasket, also called a partially open or water-damming gasket. It is used in standard (raw water) cooling systems to regulate water flow and maintain proper engine operating temperature.
What are the signs of a failed exhaust elbow gasket?
Common symptoms include visible water leaks around the manifold-elbow joint (especially when the engine is running), engine overheating, or excessive steam coming from the engine compartment.
Can I use this gasket with a closed (freshwater) cooling system?
Generally, no. Closed cooling systems typically use an open or full-flow gasket to allow maximum coolant circulation through the manifold. Using a restrictor gasket can impede flow and lead to overheating. Always confirm the correct gasket type for your specific cooling system.
How often should these gaskets be replaced?
Exhaust elbow gaskets should be replaced whenever the exhaust manifolds or elbows are serviced or replaced. It is also good practice to inspect them regularly for leaks and replace them immediately if any signs of failure are detected.
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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