MSD 35603 Super Conductor Spark Plug Wire Set Big Block Chevy HEI - 8.5mm Black

The MSD 35603 is an 8.5mm Super Conductor spark plug wire set engineered for big block Chevy race engines equipped with an HEI tower-style distributor cap. These race-tailored wires are designed to route below the header or exhaust manifold, making them an ideal fit for high-performance and competition builds running headers.

At the heart of the Super Conductor design is a copper alloy helical-wound conductor that delivers less than 50 ohms of resistance per foot — among the lowest of any spiral-core wire — while simultaneously providing RFI suppression equivalent to a 1,500-ohm wire. Each foot of finished wire contains 40 feet of tightly wound copper conductor, which, combined with a ferro-magnetic impregnated center core, creates a highly effective EMI choke that keeps interference contained within the wire and away from sensitive engine electronics.

The conductor core is reinforced with DuPont Kevlar for exceptional tensile strength and durability. Surrounding it is an extra-heavy glass braid and dielectric insulator, all encased in a proprietary 8.5mm synthetic/silicone outer jacket that resists high heat, abrasion, and tearing under demanding race conditions.

Key Features:

• 8.5mm Super Conductor wire — less than 50 ohms per foot for maximum spark energy delivery
• Copper alloy helical-wound conductor — 40 feet of conductor wound into every single foot of wire
• Ferro-magnetic impregnated core — acts as an effective EMI choke to eliminate interference
• DuPont Kevlar-reinforced conductor core — increased tensile strength for long-term durability
• Proprietary synthetic/silicone outer sleeve — resists high heat, abrasion, and tears
• 90-degree plug boots with HEI-style tower cap terminal — race-ready fitment
• Race-tailored wire routing — wires route below header/exhaust manifold
• Sold as a complete set for big block Chevy V8 engines

The MSD 35603 wire set delivers the rare combination of ultra-low resistance and superior EMI suppression, ensuring every volt of ignition energy reaches the spark plug where it belongs — resulting in a stronger, more consistent spark for improved combustion efficiency and ignition reliability.