Exhaust Elbow Full Flow Gasket – Fits MerCruiser V6 and V8 Engines (Replaces 27-863726)
Exhaust Elbow Full Flow Gasket – Fits MerCruiser V6 and V8 Engines (Replaces 27-863726) is backordered and will ship as soon as it is back in stock.
Couldn't load pickup availability
Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Exhaust Elbow Full Flow Gasket – Fits MerCruiser V6 and V8 Engines ...
Product Details
This Exhaust Elbow Full Flow Gasket – Fits MerCruiser V6 and V8 Engines (Replaces 27-863726) is a standard cooling, full flow, 4-slot gasket designed for MerCruiser stern drive and inboard engines (1998–2001) that use center rise outlet exhaust manifolds.
It serves as a direct replacement for several part numbers, including Mercury/MerCruiser 27-863726, Sierra 18-2849-1, GLM 32080, and others, ensuring wide compatibility.
- Installs between the exhaust manifold and the riser/elbow.
- Made from high-temperature graphite for a durable, long-lasting seal.
- Features a completely open design for Full Flow (Standard Cooling) systems only.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury/MerCruiser | 27-818832 |
| Mercury/MerCruiser | 27-860232 |
| Mercury/MerCruiser | 27-863726 |
| Mercury/MerCruiser | 27-87105 |
| Mercury/MerCruiser | 27-871051 |
| Sierra | 18-2849-1 |
| GLM | 32080 |
| Barr | MC4727-87105 |
| Osco | 8503-GO |
| Mallory | 9-61414 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For MerCruiser applications, this gasket is compatible with the following V6 and V8 engine models equipped with center rise outlet exhaust manifolds from 1998–2001.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| MerCruiser | V6 Stern Drive | Multiple | 4-Stroke | 1998–2001 | 27-863726 | Center rise outlet exhaust manifolds |
| MerCruiser | V8 Stern Drive | Multiple | 4-Stroke | 1998–2001 | 27-863726 | Center rise outlet exhaust manifolds |
| MerCruiser | V6 Inboard | Multiple | 4-Stroke | 1998–2001 | 27-863726 | Center rise outlet exhaust manifolds |
| MerCruiser | V8 Inboard | Multiple | 4-Stroke | 1998–2001 | 27-863726 | Center rise outlet exhaust manifolds |
| MerCruiser | 4.3L Models | Multiple | 4-Stroke | 1998–2001 | 27-863726 | Made by General Motors |
| MerCruiser | 5.0L Models | Multiple | 4-Stroke | 1998–2001 | 27-863726 | Made by General Motors |
| MerCruiser | 5.7L Models | Multiple | 4-Stroke | 1998–2001 | 27-863726 | Made by General Motors |
| MerCruiser | 7.4L Models | Multiple | 4-Stroke | 1998–2001 | 27-863726 | Made by General Motors |
| MerCruiser | 8.2L Models | Multiple | 4-Stroke | 1998–2001 | 27-863726 | Made by General Motors |
| MerCruiser | MX 6.2L Models | Multiple | 4-Stroke | 1998–2001 | 27-863726 | Made by General Motors |
Technical Specs
- Product Type
- Exhaust Elbow Gasket
- Installation
- Between manifold and riser
- Material
- Graphite
- Application
- Full Flow (Standard Cooling)
- Design
- 4-Slot Gasket
- Usage
- Center Rise Outlet Exhaust Manifolds
- Engine Types
- V6 and V8
- Years
- 1998–2001
- Warranty
- Factory warranty against defects and workmanship
- Other Technical Attributes
- Completely open design for Full Flow engines only
What’s in the Box
- 1 x Full Flow Riser Elbow Gasket (27-863726)
Installation Notes
- Disconnect the battery before starting work.
- Drain the engine coolant to a level below the exhaust manifolds.
- Carefully remove the exhaust riser or elbow from the manifold.
- Thoroughly clean both mating surfaces, removing all old gasket material and corrosion.
- Place the new gasket onto the manifold, ensuring correct alignment with the bolt holes.
- Reinstall the riser or elbow and tighten the mounting bolts to the manufacturer's specified torque sequence and values.
- Refill the cooling system.
- Reconnect the battery, start the engine, and check thoroughly for any exhaust or water leaks.
Troubleshooting & FAQ
What is a "full flow" gasket and is it different from a restricted one?
A full flow (or standard cooling) gasket has completely open passages with no restrictions. It is designed for engines where cooling water is not diverted, ensuring maximum water flow through the exhaust system. Do not use this on restricted or closed cooling systems, as it will cause cooling system malfunctions.
How do I know if this gasket fits my specific engine?
First, verify your engine model and year are listed in the compatibility table. The most reliable method is to cross-reference the OEM part number (27-863726) with the number specified in your engine's service manual or by inspecting your existing part.
What are the signs of a failing exhaust elbow gasket?
Common signs include water leaking externally from the joint between the manifold and riser, steam from the engine compartment, engine overheating, or, in critical cases, water entering the engine cylinders, which can cause catastrophic damage.
Can I reuse my old exhaust manifold bolts?
It is strongly recommended to use new bolts when replacing exhaust components. Old bolts can be stretched, corroded, or fatigued, and may not achieve the correct torque, potentially leading to exhaust or water leaks.
Why is a graphite gasket used for this application?
Graphite is an ideal material for marine exhaust applications due to its excellent resistance to high temperatures and its ability to conform to minor surface imperfections, creating a durable and reliable seal against 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.
Payment & Security
Payment methods
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
