Mercury – Quicksilver 808483T3 Distributor Cap Kit | GM Marinized V8 Engines | Delco HEI Ignition | 808483T3

Overview

There’s a certain confidence that comes when you twist the key and your V8 turns over instantly — no lag, no stumble, just that smooth, deep rumble every boater loves to hear. The Quicksilver 808483T3 Distributor Cap Kit helps make that moment reliable every single time. Designed for GM-based MerCruiser V8 engines with Delco HEI ignition systems (excluding MPI engines with ECM 555 connectors), this OEM-quality cap keeps your ignition system firing crisp and consistent under the harshest marine conditions.

Mercury built this cap for the real world — where heat, moisture, and vibration are constant companions. It’s not the kind of part you’ll think about often, and that’s the point. When it’s doing its job, you won’t have to.

Key Features

• Purpose: Ensures steady spark delivery and precise timing for smooth starts and dependable engine performance.
• Fitment: Fits V8 MerCruiser engines by GM with Delco HEI ignition systems, excluding MPI engines with ECM 555 connectors.
• Construction: Made from a PBT/PET composite for superior strength, stiffness, and resistance to heat distortion or cracking.
• Electrical Components: Solid brass terminals offer long-lasting conductivity and protect against corrosion and pitting.
• Design Advantage: Engineered to reduce RFI interference that can affect GPS, radios, or onboard electronics.

Engine & Boat Compatibility

• GM / MerCruiser V8 engines (excluding MPI ECM 555)
• Delco HEI ignition systems
• Commonly found on inboard cruisers, sterndrive setups, and performance boats

Performance & Practical Benefits

The 808483T3 distributor cap delivers more than spark — it delivers consistency. Every start, every throttle pull, every cruise feels cleaner and more predictable because the ignition system isn’t fighting weak or erratic spark transfer. The precision-molded cap keeps terminals perfectly aligned, while the brass inserts maintain a clean, low-resistance connection that stands up to heat and humidity.

You’ll notice smoother idling, quicker starts, and a more stable top-end response. And with its RFI-resistant design, you won’t get that annoying static across your depth finder or radio when the engine’s running. It’s one of those small details that adds up to a better day on the water.

Why Buy OEM

Mercury’s OEM components are built for the marine environment — not adapted from automotive parts. The materials, tolerances, and coatings are designed to handle salt spray, constant heat cycling, and long periods of storage without failure. Aftermarket parts often cut corners on materials, leading to warping or misfiring that can ruin a weekend fast.

When you stick with OEM, you’re keeping your ignition system the way Mercury intended — precise, durable, and ready for anything. It’s the kind of part you install once and don’t have to think about again for years.

FAQ

Q1: Which engines use the Quicksilver 808483T3?
A: It fits GM-based V8 MerCruiser engines with Delco HEI ignition systems, excluding MPI models with ECM 555 connectors.

Q2: What makes this different from other Quicksilver caps?
A: The 808483T3 is designed for non-MPI HEI systems, offering the same rugged build and fit as other Mercury OEM caps but with specific application coverage.

Q3: Can I install this part myself?
A: Yes. It’s a simple replacement for most owners familiar with ignition maintenance. Just label your wires before swapping to maintain proper firing order.

Q4: Is it suitable for saltwater boats?
A: Absolutely. The cap’s brass terminals and corrosion-resistant housing perform well in both saltwater and freshwater environments.

Q5: Will it interfere with my onboard electronics?
A: No. It’s designed to minimize RFI interference, keeping your electronic systems operating clearly.