Mercury – Exhaust Manifold Gasket | V12 Verado & SeaPro Series | Composite Seal | 8M0177479

Overview

Anyone who’s spent long days offshore knows how much your confidence depends on the small, unseen parts inside your engine. The big V12 outboards are impressive on their own, but they only stay that smooth and powerful when every seal is doing its job. The Mercury 8M0177479 Exhaust Manifold Gasket is one of those pieces you never think about until you need it — and when you do, you’ll want the kind that installs clean, holds tight, and keeps your engine breathing the way it was designed. It’s the kind of reliability that lets you push the throttles without hesitation, whether you’re running out at sunrise or easing back toward the harbor after a long day on the water.

Key Features

• Creates a precise, leak-free seal between the exhaust manifold and engine block.
• Built from durable, heat-resistant composite material.
• Designed specifically for the high-output Mercury 7.6L V12 platform.
• Supports proper exhaust flow and temperature stability.
• One OEM replacement exhaust manifold gasket.

Engine & Boat Compatibility

This Mercury Marine part is compatible with:

• Mercury 7.6L V12 600hp Verado outboards.
• Mercury 7.6L V12 500hp SeaPro outboards.

Commonly found on:

• Offshore center consoles
• Commercial and patrol vessels
• Large fishing boats
• Heavy-duty passenger and charter boats

Performance & Practical Benefits

A proper exhaust seal may seem simple, but anyone familiar with high-horsepower outboards knows how much strain these engines endure. Heat, vibration, and constant load shifts all push the system to its limits — and a weak or worn gasket can quickly lead to power loss, exhaust leakage, or uneven engine performance.

With the Mercury 8M0177479 gasket installed, the difference is subtle at first: the engine settles into a steady idle, the exhaust moves cleanly through the manifold, and the motor warms evenly without harsh smells or escaping gases. Over time, that consistency becomes something you feel every time you advance the throttles. You get smoother transitions, better fuel efficiency, and the kind of long-term reliability that lets you focus on the water instead of what’s happening under the cowling.

The gasket seats easily with a clean surface, giving you a firm, confident seal that holds through heat cycles and heavy running. Whether you maintain your own engine or trust a technician, this part installs without drama and restores the integrity of the entire exhaust path.

Why Buy OEM

With engines as powerful and valuable as the Mercury V12 series, taking shortcuts with aftermarket parts just isn’t worth the gamble. OEM gaskets like the 8M0177479 are engineered to match exact thickness, material composition, and fitment tolerances, ensuring your outboard performs the way Mercury intended.

Choosing genuine Mercury Marine parts means:

• A perfect, precise fit every time
• Materials proven to withstand extreme heat and pressure
• Long-term sealing performance and fewer repeat repairs
• Compatibility tested directly on the V12 platform
• Protection for your engine’s performance and warranty conditions

As any seasoned boater will tell you, OEM is about peace of mind — knowing the part you’re installing is the same one the engine was built around.

FAQ

Q1: Which Mercury engines does this gasket fit?

It fits Mercury 7.6L V12 600hp Verado and 500hp SeaPro outboards.

Q2: What makes this gasket better than aftermarket options?

OEM materials and tolerances provide a more reliable, longer-lasting seal under high heat and vibration.

Q3: How can I confirm it’s the right replacement?

Match your engine model and serial range with your service manual or parts guide.

Q4: Can it be used in both saltwater and freshwater?

Yes — the materials are designed for full marine environments.

Q5: Is installation straightforward?

For most technicians and experienced boat owners, installation is direct with standard tools.