Mercury - Exhaust Manifold Gasket - 27-33395
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The Mercury Quicksilver Exhaust Manifold Gasket 27-33395 is an OEM-style sealing gasket used between the cylinder head and exhaust manifold on compatible MerCruiser small-block GM V8 marine engines. It helps seal the exhaust ports to prevent exhaust leakage, moisture intrusion, and hot gas escape into the engine compartment.
Key Features
- Genuine Mercury/Quicksilver exhaust manifold gasket
- Part number: 27-33395
- Also referenced as 33395
- Exhaust manifold-to-cylinder head port gasket
- Standard 4-bolt manifold pattern
- Approximate gasket thickness: 1/16"
- GTIN / UPC: 745061136557
- Typically replaced in pairs on V8 engines
Engine Compatibility
Fits select MerCruiser small-block GM V8 marine engines, including 283, 305, 327, 350 / 5.7L, and 377 CID applications using compatible exhaust manifold configurations.
Serial Number Fitment Notice
Verify fitment by engine serial number, cylinder head, exhaust manifold style, and parts diagram before ordering. Exhaust gasket fitment can vary by manifold design, port shape, bolt pattern, and engine package.
When This Part Needs Replacement
Replace this gasket if there are exhaust leaks, ticking at the manifold, visible gasket failure, soot marks around the port, water staining, corrosion at the manifold joint, or whenever the exhaust manifold is removed.
Installation Notes
Clean the cylinder head and manifold sealing surfaces before installation. Inspect the manifold for warping, cracking, or corrosion, and follow Mercury service procedures for torque sequence and fastener tightening. Replace both sides when servicing a V8 pair if the opposite side shows age or leakage.
Alternate/Superseded Part Numbers
Primary Mercury references: 27-33395 and 33395. Related full set reference: 27-33395A2. Common aftermarket interchanges include Sierra Marine 18-4394, Sierra 18-0872, GLM 39280, Mallory 9-61402, and Fel-Pro 17420.
Parts Desk Insight
Exhaust manifold gaskets do more than stop noise. A leaking gasket can allow hot exhaust and moisture to escape where they should not, so it is worth checking the manifold face and bolt condition before simply installing a new gasket.
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.