Mercury MerCruiser Quicksilver Port Cylinder Head Gasket 881631
In stock items ship same or next day.
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
Product Description
Mercury Quicksilver 27-881631 is the port-side cylinder-head gasket for specified MerCruiser 496 MAG / 8.1L GM V8 engines. The cylinder-head diagram identifies separate gasket numbers for the port and starboard banks.
Key Features
- OEM number: 27-881631.
- Port cylinder-head sealing application.
- GTIN: 745061052024.
- Catalog package size: 25.75 × 10.50 × 0.50 inches; packaged weight: 0.71 lb.
Engine Compatibility
Cataloged applications include MCM 496 MAG and MAG H.O., plus MIE 8.1L base and H.O. engines. Specific examples include 8.1L Inboard Base serials 0M026000–0M319124 and 8.1L Inboard H.O. serials 0M026000–0M319190. Confirm the engine serial number and port-bank callout.
Alternate Part Numbers
27-881631 supersedes 27-881631001.
Replacement and Installation
Investigate the cause of a head-gasket failure before reassembly. Inspect the head and block sealing surfaces and follow the engine service manual for gasket orientation, fastener replacement requirements and tightening sequence.
Parts Desk Insight
Port and starboard head gaskets are distinct catalog items on this engine family. Identify the engine bank before ordering.
Manufacturer Parts Lookup
Open Mercury’s official parts finder and check the engine or drive serial number and assembly callout.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.