Exhaust Manifold Gasket for MerCruiser GM V8 5.0L and 5.7L – OEM 27-33395
Exhaust Manifold Gasket for MerCruiser GM V8 5.0L and 5.7L – OEM 27-33395 is backordered and will ship as soon as it is back in stock.
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Exhaust Manifold Gasket for MerCruiser GM V8 5.0L and 5.7L – OEM 27...
Exhaust Manifold Gasket for MerCruiser GM V8 5.0L and 5.7L – OEM 27-33395 is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket exhaust manifold gasket is designed for selected MerCruiser applications using GM small-block V8 engines. Catalog information identifies OEM Mercury Marine part number 27-33395 for GM 5.0L and 5.7L applications. The gasket seals the joint between the exhaust manifold and the cylinder head to help prevent exhaust leaks.
This listing is for a single exhaust manifold gasket. It is not an exhaust elbow gasket, riser gasket, bellows, or complete manifold repair kit.
- Application: selected MerCruiser stern-drive and inboard systems using GM small-block V8 engines.
- Engine range supported by the available catalog reference: GM 5.0L and 5.7L.
- Installation location: between the exhaust manifold and cylinder head.
- Aftermarket replacement component; verify the gasket shape and bolt-hole layout before ordering.
Part Number References
Use the manufacturer part number and the existing gasket or manifold configuration when confirming fitment. The following reference is documented for this gasket application:
| Brand | Part Number | Reference Type |
|---|---|---|
| Mercury Marine / MerCruiser | 27-33395 | OEM reference |
Engine and Application Compatibility
The available catalog relationship identifies this gasket for GM 5.0L and 5.7L V8 applications. Engine model, exhaust configuration, serial number, and manifold design can affect fitment, so confirm all conditions against the engine service information before installation.
| Brand | Engine Application | Displacement | Stroke | Years | OEM Reference | Application Note |
|---|---|---|---|---|---|---|
| MerCruiser | GM small-block V8 | 5.0L | 4-Stroke | Not specified | 27-33395 | Exhaust manifold-to-cylinder-head gasket |
| MerCruiser | GM small-block V8 | 5.7L | 4-Stroke | Not specified | 27-33395 | Exhaust manifold-to-cylinder-head gasket |
Important: Do not assume compatibility with 6.2L, 377 CID, wet-joint, dry-joint, open-cooling, or closed-cooling configurations solely from engine displacement. Compare the original gasket, manifold design, engine serial number, and service-manual part number.
Technical Specifications
- Product Type
- Exhaust manifold-to-cylinder-head gasket
- Application
- Selected MerCruiser GM small-block V8 applications
- Documented Engine Range
- GM 5.0L and 5.7L
- Installation Position
- Between the exhaust manifold and cylinder head
- Construction
- Aftermarket replacement gasket; exact material and thickness are not specified in the available product record
- Quantity
- 1 gasket
- OEM Reference
- 27-33395
What's in the Box
- 1 × Exhaust manifold gasket
Installation Notes
- Disconnect the battery and allow the engine to cool completely.
- Follow the engine manufacturer's service procedure for cooling-system preparation.
- Remove any hoses, wires, sensors, or other components that obstruct access to the exhaust manifold.
- Remove the manifold fasteners and carefully separate the manifold from the cylinder head.
- Clean both mating surfaces thoroughly. Remove old gasket material, carbon, corrosion, and debris without damaging the sealing surfaces.
- Compare the replacement gasket with the removed gasket and verify the ports and bolt holes are correctly aligned.
- Install the gasket in the orientation specified by the engine or manifold manufacturer.
- Reinstall the exhaust manifold and tighten the fasteners in the specified sequence and to the manufacturer's torque values.
- Reconnect all removed hoses, wires, and sensors, then restore the cooling system as required.
- Run the engine according to the service procedure and inspect the manifold joint for exhaust, water, or coolant leaks.
Troubleshooting and FAQ
How do I confirm that this gasket fits my engine?
Confirm OEM reference 27-33395 against the engine service manual, engine serial number, manifold configuration, and the shape of the original gasket. Verify the bolt-hole pattern and all exhaust and cooling passages before installation.
What are common signs of a failed exhaust manifold gasket?
Possible symptoms include ticking or hissing from the manifold area, exhaust odor, visible soot at the manifold-to-head joint, reduced engine performance, or evidence of water or coolant leakage. Inspect the system only after the engine has cooled and follow proper marine-service safety procedures.
Is sealant required?
Do not apply sealant unless the engine or gasket manufacturer's service instructions specifically require it. Many exhaust manifold gaskets are installed dry, but the service manual takes priority.
Is this an OEM gasket?
No. This listing is for an aftermarket replacement gasket referenced to Mercury Marine / MerCruiser OEM part number 27-33395. It is not represented as a genuine Mercury Marine component.
Does this listing include a complete gasket kit?
No. This listing includes one exhaust manifold gasket only. It does not include riser gaskets, elbow gaskets, O-rings, bolts, bellows, or other manifold-repair components.
Safety and Important Information
- Verify the OEM reference, engine serial number, manifold style, gasket shape, and bolt-hole layout before ordering.
- Do not use this page alone to confirm fitment for a specific boat or engine configuration.
- Allow the engine to cool completely before inspection or installation.
- Use the manufacturer's torque sequence and service specifications.
- Professional marine-service installation is recommended when the correct procedure or configuration is uncertain.
About Sea Sierra
- Marine Replacement Parts — We supply aftermarket components for maintenance and repair applications.
- Fitment-Focused Listings — Product information is organized around documented part-number and application references.
- Support for Verification — Compare the original component and service-manual information before installation.
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