Mercury – Quicksilver Manifold Gasket Set | For V8 MerCruiser 350 Mag, 5.0L & 5.7L/LX Engines | 807473A1

Overview

Keep your MerCruiser’s exhaust system sealed and running efficiently with the Mercury Marine 807473A1 Quicksilver Manifold Gasket Set. Designed specifically for V8 MerCruiser 350 Mag, 5.0L, and 5.7L/LX (Gen+) sterndrive and inboard engines made by General Motors (1996 and newer), this OEM three-piece set provides a perfect seal between your manifold and cylinder head. A tight seal means fewer leaks, better performance, and longer life for your engine. Built with high-quality materials and Mercury’s proven engineering, it’s the kind of reliability that boaters depend on year after year.

Key Features

• Purpose: Provides a secure seal between the exhaust manifold and cylinder head to prevent exhaust or coolant leaks.
• Compatibility: Fits V8 MerCruiser 350 Mag, 5.0L & 5.7L/LX (Gen+) engines (1996 & newer).
• Complete Kit: Includes three pieces — port and starboard gaskets, plus a star washer for installation.
• Construction: Built with high-grade, heat-resistant materials to handle marine exhaust temperatures.
• Ease of Installation: Designed as a direct OEM replacement, ensuring precise fit and long-lasting performance.

Engine & Boat Compatibility

• V8 MerCruiser sterndrive and inboard engines (1996 & newer) made by General Motors, including:
• 350 Mag
• 5.0L
• 5.7L/LX (Gen+)

Performance & Real-World Benefits

The 807473A1 manifold gasket set plays a crucial role in maintaining proper exhaust flow and cooling. A compromised seal can lead to exhaust leaks, overheating, or water intrusion into the cylinders — all of which can cause major engine damage.

This Mercury OEM set is made from durable materials that resist compression, heat, and corrosion. The gaskets conform perfectly to your engine’s machined surfaces, creating a lasting seal that helps maintain exhaust efficiency and prevent leaks under heavy load. Whether you’re doing routine maintenance or a complete manifold replacement, this kit restores factory-level reliability.

Why Choose Mercury OEM

The Quicksilver 807473A1 is a genuine Mercury Marine part, engineered and tested to withstand the harsh marine environment. Aftermarket gasket sets may look similar but often use materials that degrade under heat and moisture, leading to premature leaks or failure.

Mercury OEM gaskets are built to handle constant temperature swings, vibration, and water exposure — the same parts used on new MerCruiser builds. It’s quality you can trust every time you start your engine.

FAQ

Q1: What engines does this gasket set fit?
It fits V8 MerCruiser 350 Mag, 5.0L & 5.7L/LX (Gen+) engines made by General Motors, 1996 and newer.

Q2: How many pieces are in the kit?
The kit includes three pieces — two manifold gaskets (port and starboard) and a star washer.

Q3: What does it seal?
It seals the exhaust manifold to the cylinder head, preventing exhaust gas or coolant leaks.

Q4: When should I replace it?
Replace whenever you remove the manifolds or notice signs of exhaust leaks, corrosion, or gasket wear.

Q5: Why OEM instead of aftermarket?
Mercury OEM gaskets are made with superior heat-resistant materials and exact fitment, ensuring a perfect seal and long-term reliability.