Upgrade your ignition system with the power, precision, and durability of MSD 8.5mm Super Conductor Spark Plug Wires—the go-to choice for high-performance builds. Engineered for maximum spark delivery with minimal resistance, these wires are built to handle the demands of racing and street performance alike.

At the heart of each MSD 8.5mm Super Conductor Wire is a copper alloy conductor that offers an ultra-low resistance of just 40–50 ohms per foot—allowing more spark energy to reach the plug. This means quicker starts, smoother idle, and more consistent combustion at high RPMs. Whether you’re pushing big power or seeking better efficiency, these wires deliver unmatched performance.

A tough outer sleeve protects against heat, abrasion, and chemical exposure, making the MSD 8.5mm spark plug wires ideal for extreme engine bay environments. The Kevlar core, fiberglass braid, and high-dielectric insulator ensure long-lasting durability, even under the rigors of track use.

Designed with a helically wound core to suppress EMI (electromagnetic interference), the MSD 8.5mm Super Conductor wires prevent crossfire and radio interference—critical for modern engines running sensitive electronics and data systems.

Pre-terminated sets are available for a wide range of applications, or choose a universal kit to custom-fit your setup. If you’re serious about performance and reliability, upgrade your ignition system with spark plug wires trusted by professionals around the world. Drive with confidence—spark with MSD.

When you’re upgrading your ignition system, don’t overlook the plug wires themselves! MSD’s 8.5mm Super Conductor spark plug wires are designed with a conductor wound extremely tightly around the core for effective isolation of electromagnetic interference (EMI). The low resistance means reduced energy loss along the length of the plug wire - resistance of only 40 to 50 ohms per foot for a hotter spark. There’s a reason why MSD components and MSD Super Conductor plug wires are a preferred option for high performance builds; they deliver durability, power and precision, for racing or street performance. 

Performance Benefits & Key Features

With a Kevlar core, fiberglass braid and high-dieletric insulator around a copper alloy conductor, MSD 8.5mm plug wires are designed to perform and to last. The helically wound core suppresses EMI to eliminate crossfire between plug wires and cut radio interference, which is critical for modern vehicles with sophisticated electronics and data systems. The tough outer sleeve (available in red or black, depending on fitment) is designed for extreme underhood conditions and high heat. A set of quality plug wires means a smoother idle, better fuel economy, easier cold starts and more consistent combustion at peak RPM range. Pre-terminated sets are available for many fitments, or you can choose a universal kit that you can custom-fit for your engine and your preferences. 

Fitment, Compatibility and Applications 

MSD 8.5mm Super Conductor plug wire sets are available for a number of Honda, AMC, Ford, Mopar and GM models. In addition to plug wire sets, JEGS also carries a full ignition setup of distributor, coil and wires for 90s F-body Camaro and Firebird models. Select plug wire sets are compatible with Chevy, Pontiac, Buick and Olds HEI distributors. Makes and models include 1987 Buick Grand National V6s, Corvette, Camaro, GTO and Chevy trucks with LS1 V8, GM Gen V LT1 and LT4 engines, 90s Caprice and Impala SS LT1 V8s, marine applications, Chevy big block V8s, Chrysler and Dodge big block V8s with MSD distributors, small block Mopar engines, Jeep 4.0 I-6 engines, Ford truck and Mustang applications, Mini Cooper, Volkswagen, Toyota trucks, midget cars, and 50 ft rolls of universal fit plug wire to customize your fitment. MSD 8.5 mm Super Conductor plug wires are a great and easy way to upgrade your ignition system’s performance.