MSD 31523 Super Conductor 8.5mm Single Hemi Spark Plug Wire Set, Black

The MSD 31523 Super Conductor 8.5mm Single Hemi Spark Plug Wire Set is a high-performance, cut-to-fit ignition wire set designed for single-plug Hemi engines. This black wire set delivers maximum spark energy to the plugs by combining ultra-low resistance with superior EMI suppression — a combination that makes MSD's Super Conductor line the benchmark in performance ignition wiring.

At the core of the Super Conductor design is a copper alloy conductor wound extremely tight around a ferro-magnetic impregnated center core. This construction packs over 40 feet of conductor into a single foot of finished wire, resulting in just 40–50 ohms of resistance per 12 inches — the lowest resistance of any helically wound wire — while delivering RFI suppression equivalent to a 1,500-ohm wire. More spark energy reaches the plug, and EMI stays contained within the wire where it cannot interfere with other onboard electronics.

The outer jacket is built to handle the demands of high-performance and race applications. A proprietary blend of silicone and synthetic material provides exceptional resistance to high heat, abrasion, and tearing. Underneath the high-temperature boots, dual crimp stainless steel terminals feature two separate crimps — one gripping the wire sleeve, and a second securing the conductor — ensuring a locked, reliable connection.

What's Included:

• Black 8.5mm Super Conductor spark plug wire (bulk/cut-to-fit)
• Black Hemi tubes, boots, and terminals
• Mini-crimper tool included
• Pre-crimped at the spark plug end

Key Features:

• Ultra-low resistance: Only 40–50 ohms per 12 inches — lowest of any helically wound wire
• Superior EMI/RFI suppression: Ferro-magnetic impregnated center core acts as an effective EMI choke
• Copper alloy conductor: Over 40 feet tightly wound per foot of wire for maximum conductivity
• Dual crimp stainless steel terminals: Independent crimps for sleeve and conductor ensure a secure, long-lasting connection
• High-temp silicone/synthetic jacket: Resistant to heat, abrasion, and tearing
• 8.5mm diameter construction for a professional, clean engine bay appearance
• Designed for single-plug Hemi engines

The MSD 31523 is the go-to ignition wire solution for enthusiasts and racers building or maintaining a single-plug Hemi combination who demand every volt of ignition energy delivered to the spark plug, every time.