Quicksilver – Exhaust Manifold | V8 MerCruiser Series | Coated Cast Iron | 860246A15

Overview

There’s a certain warmth that comes from working on a V8 MerCruiser — the kind of engine that growls to life with a tone that reminds you why you got into boating in the first place. When you’re replacing a manifold on one of these motors, you want a part that feels solid in your hands and trustworthy once installed. This Quicksilver exhaust manifold brings that same confidence. It’s built for boaters who know their engines well enough to feel when something’s right, and this part carries that feeling the moment it’s unboxed.

Key Features

• Cast iron exhaust manifold for select V8 MerCruiser engines
• Hot dipped and powder coated for corrosion resistance
• Compatible with port or starboard installation
• Fits 305, 350, and 377 cubic inch engines (1983–2002)
• Includes gasket for clean, secure sealing
• Quicksilver part number 860246A15

Engine & Boat Compatibility

• Fits MerCruiser sterndrive and inboard V8 engines made by General Motors
• Compatible with 305, 350, and 377 cubic inch platforms
• Common in performance runabouts, small cruisers, sport boats, and classic cabin boats
• Suitable for boats operated in freshwater or saltwater with routine maintenance

Performance & Practical Benefits

The first thing you’ll appreciate is the weight and balance of the manifold. It has that reassuring heaviness that tells you it’s ready to handle years of heat cycles and vibration. Once installed, the engine breathes more freely, and that familiar V8 tone sharpens into a cleaner, deeper rhythm. A tight manifold makes a surprising difference — smoother exhaust flow, less ticking, and a steadier feel at idle.

The protective coatings are a big advantage for boaters who store on the water or run in brackish bays. The hot dipped and powder coated finish helps keep corrosion at bay, protecting the coolant passages and exterior surfaces from long-term wear. The included gasket seats cleanly, and the fitment has that OEM exactness that lets you torque the bolts down without wrestling anything into place.

You’ll feel the difference in real use: more consistent temperature control, fewer exhaust leaks, and a dependable exhaust note that keeps your engine feeling strong. It’s the kind of upgrade that extends the life of a classic V8 and restores the confidence you expect when you push the throttle forward.

Why Buy OEM

With big-block and small-block marine V8s, precision isn’t optional. Aftermarket manifolds often look close, but they rarely match Mercury Marine’s casting quality or the internal flow patterns that keep the engine running efficiently. This Mercury Marine part is built exactly to the specifications the engine was designed around, so everything fits cleanly and performs as expected.

Choosing OEM here is simply smart boating. You’re investing in longevity, predictable cooling, and a manifold that won’t let you down halfway through the season. Ask any veteran mechanic — exhaust components are one place where cutting corners isn’t worth it.

FAQ

Q1: Which engines does this manifold fit?

It fits V8 MerCruiser engines made by General Motors, including 305, 350, and 377 cubic inch models from 1983 to 2002.

Q2: What makes it better than aftermarket versions?

The casting quality, internal flow design, and corrosion protection match Mercury Marine standards exactly.

Q3: How do I confirm it's the right part?

Check your engine serial or service manual. If it calls for part number 860246A15, this is the correct manifold.

Q4: Is it suitable for saltwater use?

Yes. The coating is designed for both freshwater and saltwater when properly maintained.

Q5: Is installation straightforward?

Most experienced boaters or technicians can install it confidently thanks to precise fitment and included gasket.