Mercury – Quicksilver 816608Q68 Red Wire Spark Plug Wire Kit | GM V8 Marine Engines | Delco HEI Ignition | 816608Q68

Overview

Strong spark starts with solid connections. The Quicksilver 816608Q68 Red Wire Spark Plug Wire Kit gives your GM-based V8 marine engine the clean, consistent ignition it was designed for. Built for Delco HEI ignition systems (1993–2010), this complete set of eight red wires delivers reliability, endurance, and a bold OEM look under the cowl.

Each wire is precision-cut for perfect length, routed neatly to each plug without stress or slack. Designed to handle the heat, vibration, and moisture of real boating life, these wires keep your spark strong and your engine firing smooth — whether you’re idling in the marina or pushing wide open across the bay.

Key Features

• Purpose: Replaces old or corroded plug wires to restore strong, steady spark across all eight cylinders.
• Fitment: For V8 GM marinized engines (350, 454, and 502 CID) using Delco HEI ignition systems, model years 1993–2010.
• Kit Contents: Includes a complete set of 8 red spark plug wires with pre-installed boots at the plug ends.
• Design: Each wire is custom-length for precise routing and secure plug seating.
• Performance: Built for durability, efficiency, and electrical insulation in harsh marine environments.

Engine & Boat Compatibility

• V8 GM-based MerCruiser inboard and sterndrive engines (350, 454, 502 CID)
• Delco HEI ignition systems, 1993–2010 models
• Common in sport cruisers, large runabouts, and performance boats

Performance & Practical Benefits

The 816608Q68 wire kit gives your ignition system new life. Each wire is engineered for low resistance and excellent conductivity, delivering consistent voltage from the distributor to every spark plug. That means stronger ignition, smoother starts, and better throttle response — no more misfires or uneven idle from weak connections.

The marine-grade insulation protects against heat, oil, and moisture, while the red jacket adds a clean, custom look to your engine bay. Because each lead is pre-fitted and measured for your setup, installation is simple — just pull the old wires, match them one by one, and press these firmly into place.

Why Buy OEM

Mercury’s OEM ignition components are built to the same high standards as the engines themselves. Unlike generic wire sets that may be slightly off in length or resistance, Quicksilver wires are engineered for exact fit and optimal performance under marine loads.

Aftermarket sets can’t always handle marine heat and vibration, often breaking down or corroding early. With OEM, you’re getting the right wire lengths, correct terminal boots, and the durability tested in Mercury’s own labs. It’s the same ignition quality your engine left the factory with.

FAQ

Q1: What engines fit the Quicksilver 816608Q68 kit?
A: It fits V8 GM marine engines (350, 454, 502 CID) with Delco HEI ignition systems, from 1993–2010.

Q2: How many wires are included?
A: The kit includes a complete set of 8 red spark plug wires, pre-fitted with plug boots.

Q3: Can it handle saltwater conditions?
A: Yes. The insulation and terminals are designed to resist corrosion and maintain performance in both salt and freshwater.

Q4: Is installation complicated?
A: No. The wires are already cut to length — just replace them one at a time to maintain firing order.

Q5: What are the benefits of OEM wires over aftermarket?
A: OEM wires ensure perfect fit, proper resistance, and marine-grade durability. They’ll last longer and deliver cleaner spark.