Mercury MerCruiser 2BBL Carburetor Base Mounting Gasket - 27-8079821
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The Mercury MerCruiser Quicksilver 27-8079821 is a genuine Mercury Marine OEM carburetor base mounting gasket used on select MerCruiser carbureted marine engines. This gasket seats between the 2-barrel MerCarb or Rochester carburetor base and the intake manifold, creating an airtight seal to prevent vacuum leaks that cause rough idling and lean running conditions.
Technical Specifications
- Component Type: 2-Barrel (2BBL) carburetor base mounting flange gasket.
- Carburetor Fit: MerCarb and Rochester 2-Barrel carburetor layouts.
- Dimensions: 4.88" L x 3.00" W x 0.13" thick.
- Weight: 0.05 lb.
- GTIN/UPC: 745061491397.
- Mercury/MerCruiser part number: 27-8079821.
- Manufacturer part number: 8079821.
Engine Compatibility
- MerCruiser 3.0L: Fits 3.0L GM 181 I/L4 carbureted engines.
- MerCruiser 4.3L: Fits 4.3L Alpha/Bravo (262 CID GM V6) carbureted engines.
- MerCruiser 5.0L & 5.7L: Fits 5.0L (305 CID) and 5.7L (350 CID V8) carbureted Alpha/Bravo engines.
Alternate/Superseded Part Numbers
- 27-8079821 — current Mercury/MerCruiser formatted part number
- 8079821 — manufacturer part number
- 27-807982 — earlier Mercury reference
- 27-70143 / 27-701431 — earlier Mercury references
- 70143B1 / 807982B — earlier Mercury references
- Sierra 18-0994 — aftermarket cross-reference; verify by application
- GLM 32180 — aftermarket cross-reference; verify by application
Parts Desk Insight
This carburetor base gasket is a common service item on MerCruiser carbureted engines. Replace it any time the carburetor is removed for service, rebuild, or cleaning. A compressed or reused gasket can cause vacuum leaks, rough idle, and lean fuel conditions that are difficult to diagnose without first confirming the base seal is intact.
Shipping: Ships same or next day for fast Canada wide shipping. ⚓
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 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.