Mercury – Quicksilver Exhaust Manifold Gasket | Exhaust System Seal | Marine-Grade Composite | 33395

Overview

A strong seal in your exhaust system keeps your engine quiet, efficient, and protected. The Mercury Marine 33395 Quicksilver Exhaust Manifold Gasket is built for V8 MerCruiser sterndrives and inboard engines made by General Motors, including 283, 305, 350, and 377 CID models. Made from durable marine-grade composite material, this gasket is designed to handle the heat, vibration, and pressure of a true marine environment. It creates a reliable barrier that prevents exhaust leaks, protecting your engine’s performance and helping it run smoothly and quietly.

Key Features

• Purpose: Seals the connection between the exhaust manifold and cylinder head to prevent leaks and maintain engine efficiency.
• Material: Constructed from marine-grade composite designed to resist heat, pressure, and moisture.
• Performance: Ensures proper exhaust flow while preventing gases from escaping into the engine bay.
• Durability: Built to handle continuous heat cycles and marine vibration without shrinking or cracking.
• Compatibility: Fits V8 MerCruiser sterndrives and inboards (283, 305, 350, and 377 CID GM-based engines).
• Installation: Replace anytime the exhaust manifold is removed to ensure a clean, reliable seal.

Engine & Boat Compatibility

• Designed for GM-built MerCruiser V8 engines — 283, 305, 350, and 377 cubic inch models.
• Works on sterndrives and inboard engines used in a variety of runabouts, cruisers, and sport boats.
• Suitable for both freshwater and saltwater applications.
• Refer to your owner’s or service manual for proper torque settings and installation guidance.

Performance & Practical Benefits

The 33395 gasket provides a tight seal that prevents exhaust gas leaks, protecting nearby components and maintaining proper engine backpressure. A clean seal ensures smoother operation, better fuel efficiency, and quieter performance.

The composite material is built to handle the high heat and salt exposure that destroy ordinary gaskets. It keeps its shape through countless expansion and cooling cycles, giving your MerCruiser the long-term reliability it was built for. Replacing this gasket whenever you service your exhaust system ensures lasting protection and peak performance.

Why Buy OEM

With exhaust components, precision and material quality are non-negotiable. The Quicksilver 33395 is a genuine Mercury Marine OEM gasket, designed to fit GM-based MerCruiser engines perfectly. Aftermarket gaskets can warp, crack, or fail to align correctly, leading to leaks or reduced performance.

Mercury’s OEM parts use the same materials and designs tested for factory durability. They’re made to seal tight, resist heat, and stand up to the marine environment — keeping your engine breathing properly and running efficiently for years.

FAQ

Q1: Which engines does this gasket fit?
It fits GM-built V8 MerCruiser engines — 283, 305, 350, and 377 cubic inch models used in sterndrives and inboards.

Q2: What’s the gasket made from?
A marine-grade composite that resists heat, pressure, and corrosion in marine environments.

Q3: When should it be replaced?
Anytime the exhaust manifold is removed or if you notice exhaust leaks or noise.

Q4: Can it handle saltwater operation?
Yes — it’s designed for both fresh and saltwater use.

Q5: Why use an OEM gasket instead of aftermarket?
OEM ensures proper fit, sealing strength, and material quality, reducing the risk of leaks or premature failure.