Exhaust Manifold and Spacer Gasket for MerCruiser V6/V8 Applications – Reference 27-863726
Exhaust Manifold and Spacer Gasket for MerCruiser V6/V8 Applications – Reference 27-863726 is backordered and will ship as soon as it is back in stock.
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Exhaust Manifold and Spacer Gasket for MerCruiser V6/V8 Application...
Exhaust Manifold and Spacer Gasket for MerCruiser V6/V8 Applications – Reference 27-863726 is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket exhaust manifold and spacer gasket is designed for specified MerCruiser stern drive and inboard applications using wet-joint exhaust systems. It is listed for V6 and V8 engines with the applicable exhaust manifold and spacer configuration.
The gasket is associated with MerCruiser reference 27-863726 and is also listed with GLM 32080, Mallory 9-61414, and Sierra 18-2849-1 references. Always compare the gasket layout and the part number specified for your exact exhaust system before ordering.
- Installs at the exhaust manifold and spacer or elbow joint.
- Fits listed MerCruiser V6, small-block V8, and big-block V8 wet-joint applications.
- Also listed as a dry-joint alternative for specified GM V6/V8 small-block applications from the stated serial range.
- Sold as one gasket; no bolts, spacers, O-rings, manifolds, or elbows are included.
Part Number Matrix
The following are customer-facing OEM and aftermarket reference numbers associated with this gasket. They are provided for cross-reference purposes and should be checked against the original part and engine configuration.
| Brand | Reference Number |
|---|---|
| MerCruiser | 27-863726 |
| MerCruiser | 27-818832 |
| MerCruiser | 27-860232 |
| MerCruiser | 27-871051 |
| MerCruiser | 27-87105 |
| GLM | 32080 |
| Mallory | 9-61414 |
| Sierra | 18-2849-1 |
| OMC | 0508606 |
Engine & Model Compatibility
Use the complete engine family, joint type, displacement, and serial-range information below when checking fitment. The listed conditions must match your engine and exhaust hardware.
| Brand | Model / Engine Family | Displacement | Joint Type | Year / Serial Condition | Reference |
|---|---|---|---|---|---|
| MerCruiser | 175–205 V6 | GM 229/262 CID | Wet joint | 1983–0M serial numbers | 27-863726 |
| MerCruiser | 200–320 V8 small block | GM 305/350/377 CID | Wet joint | 1983–0M serial numbers | 27-863726 |
| MerCruiser | 330–370 V8 big block | GM 454/502 CID | Wet joint | 1981 and later | 27-863726 |
| GM / MerCruiser | V6/V8 small block | Not otherwise specified | Dry-joint alternative | 0M serial numbers and later | Confirm the complete exhaust configuration |
Technical Specifications
- Product Type
- Exhaust manifold and spacer gasket
- Primary Application
- Specified MerCruiser stern drive and inboard exhaust systems
- Engine Families
- MerCruiser V6, V8 small block, and V8 big block applications as listed
- Joint Types
- Wet joint; dry-joint alternative for specified GM V6/V8 small-block applications
- Primary Reference
- 27-863726
- Installation Location
- At the exhaust manifold and spacer or elbow joint
- Quantity
- One gasket
- Material
- Not specified by the product record
What’s in the Box
- 1 x Exhaust manifold and spacer gasket
Installation Notes
- Allow the engine and exhaust components to cool completely before beginning work.
- Disconnect the battery and follow the engine manufacturer's safety procedures.
- Remove the exhaust elbow, spacer, or related component as required for access.
- Clean the mating surfaces carefully and remove old gasket material, corrosion, and debris.
- Confirm that the new gasket's openings and bolt-hole pattern match the manifold and spacer or elbow.
- Install the gasket in the same joint location as the removed gasket.
- Reinstall the exhaust component and tighten the fasteners using the manufacturer's specified sequence and torque values.
- Restore any removed cooling-system connections and inspect the assembly before starting the engine.
- Run the engine according to the service-manual procedure and check for exhaust, cooling-water, and joint leaks.
Troubleshooting & FAQ
Where does this gasket install?
This gasket installs at the exhaust manifold and spacer or elbow joint for the applicable MerCruiser exhaust configuration.
Which engines are listed for this gasket?
The company fitment record lists MerCruiser 175–205 V6 engines with GM 229/262 CID, 200–320 V8 small-block engines with GM 305/350/377 CID, and 330–370 V8 big-block engines with GM 454/502 CID. The listed wet-joint and serial-range conditions must also match.
Can this gasket be used on a dry-joint system?
The product record lists a GM V6/V8 small-block dry-joint alternative for 0M serial numbers and later. Confirm the exact exhaust arrangement and gasket shape before installation; do not substitute it solely because the engine is a V6 or V8.
What reference numbers can I use to check fitment?
Relevant references include MerCruiser 27-863726, 27-818832, 27-860232, 27-871051, and 27-87105, plus GLM 32080, Mallory 9-61414, Sierra 18-2849-1, and OMC 0508606.
Does the package include an elbow, spacer, bolts, or O-rings?
No. The package contains one gasket only. Exhaust elbows, spacers, bolts, O-rings, manifolds, and other repair-kit components are not included.
What should I do if the gasket does not align?
Do not force or trim the gasket. Stop installation and verify the engine model, displacement, joint type, serial condition, reference number, and mating-component layout.
Is this an OEM part?
This is an aftermarket replacement gasket. The listed OEM and aftermarket numbers are reference numbers used to help confirm application.
Safety & Important Information
- Verify the original gasket, bolt-hole pattern, passage layout, engine displacement, joint type, and serial condition before ordering.
- Do not combine fitment information from different joint types or engine families.
- Use the manufacturer's service information for fastener torque, cooling-system procedures, and final leak checks.
- Professional installation is recommended when working on marine exhaust and cooling systems.
About Sea Sierra
- Marine replacement parts selected for practical repair and maintenance applications.
- Reference-focused product information to help match replacement parts with existing marine hardware.
- Worldwide fulfillment options are available; delivery timing and cost are shown at checkout.
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