Mercury – Quicksilver 816608Q78 Red Wire Spark Plug Wire Kit | MerCruiser Black Scorpion Tow Sports Engines | Delco HEI Ignition | 816608Q78

Overview

The Quicksilver 816608Q78 Red Wire Spark Plug Wire Kit keeps your MerCruiser Black Scorpion tow-sports engine firing strong and running clean. Built for V8 GM-based marine engines with Delco HEI ignition systems (1997–1998), this OEM wire set delivers a sharp, reliable spark and the durability you need for hard-pulling performance on the water.

Each wire is precision-cut to the correct length, with pre-fitted boots that snap into place easily. The bright red jacket isn’t just for looks — it’s made from high-temp, marine-grade material that holds up against heat, vibration, and moisture, season after season.

Key Features

• Purpose: Replaces worn or corroded spark plug wires for stronger ignition and consistent performance.
• Fitment: For V8 GM-based MerCruiser Black Scorpion engines (1997–1998) using Delco HEI ignition systems.
• Kit Contents: Includes a complete set of 8 red plug wires with pre-installed boots for quick installation.
• Design: Each wire is custom-length to fit cleanly and reach the correct plug without tension or excess slack.
• Marine Durability: Built for efficiency, endurance, and resistance to heat and salt exposure in marine environments.

Engine & Boat Compatibility

• MerCruiser Black Scorpion tow-sports engines (V8 GM-based, 1997–1998)
• Delco HEI ignition systems
• Commonly used in tournament ski boats, wake boats, and high-torque tow setups

Performance & Practical Benefits

If your ignition feels weak or your idle’s gotten rough, worn plug wires could be the reason. The 816608Q78 kit brings back crisp spark delivery and steady firing across all eight cylinders. Each wire’s low-resistance core ensures full voltage transfer for better combustion, quicker starts, and smoother acceleration.

These wires are tough enough for repeated hot starts, long idle sessions, and hours under load. The marine-grade insulation resists cracking and corrosion, while the snug-fitting boots help keep moisture out. The red jacket gives your engine bay that clean, professional look that’s pure Mercury.

Why Buy OEM

With ignition components, precision matters. Mercury’s OEM wires are designed specifically for their marine engines — not repurposed automotive sets. Each wire is tested for correct resistance, flexibility, and heat resistance to handle marine stress.

Aftermarket wire kits might be cheaper, but the fit and materials rarely hold up the same way. Quicksilver OEM wires ensure the right spark, the right length, and the long-term reliability Mercury owners expect.

FAQ

Q1: What engines fit the Quicksilver 816608Q78 kit?
A: It’s made for V8 GM-based MerCruiser Black Scorpion tow-sports engines (1997–1998) with Delco HEI ignition systems.

Q2: What’s included in the kit?
A: A complete set of eight red spark plug wires, each with pre-installed boots.

Q3: Can these wires handle saltwater conditions?
A: Yes. They’re built with corrosion-resistant terminals and marine-grade insulation for both salt and freshwater use.

Q4: Are they easy to install?
A: Very. Each wire is cut to length — just swap them one by one to maintain your firing order.

Q5: Why choose OEM instead of aftermarket wires?
A: OEM wires guarantee the right fit, better spark transfer, and durability tested for marine conditions — no guesswork, no early failures.