MSD 31373 Super Conductor 8.5mm Spark Plug Wire Set Big Block Chevy Socket Black

The MSD 31373 Super Conductor 8.5mm Spark Plug Wire Set is a custom-fit, bolt-on performance ignition upgrade designed for Big Block Chevrolet engines equipped with a socket-style distributor cap. These pre-cut wires deliver maximum spark energy to the plugs with the lowest resistance of any helically wound wire on the market.

At the heart of the Super Conductor design is a copper alloy conductor wound extremely tight — over 40 feet of conductor packed into every single foot of wire — producing just 40–50 ohms of resistance per foot. Yet despite this ultra-low resistance, the ferro-magnetic impregnated center core acts as a highly effective EMI choke, suppressing radio frequency interference (RFI) to levels equivalent to a 1,500-ohm wire. That means more spark energy reaches the plug without electronic interference affecting your vehicle's onboard systems.

The outer jacket is constructed from a proprietary silicone and synthetic blend that resists high heat, abrasion, and tears — built to survive the demanding underhood environment of a performance V8. Underneath the high-temperature silicone boots, dual crimp stainless steel terminals feature snap-lock retention for a secure, rattle-free connection at both the distributor and spark plug ends.

Key Features:

• 8.5mm diameter Super Conductor spark plug wire set
• Ultra-low resistance: only 40–50 ohms per foot
• RFI suppression equivalent to a 1,500-ohm wire
• Ferro-magnetic impregnated spiral core for superior EMI choke
• Proprietary silicone/synthetic outer jacket — heat, abrasion, and tear resistant
• Dual crimp stainless steel snap-lock terminals
• Female/socket-style distributor terminal ends
• Eight multi-angle spark plug boots — gray silicone
• Pre-cut to exact specifications — true bolt-on installation
• Includes clip-on cylinder number markers for easy identification
• Black wire jacket finish
• Sold as a complete 8-wire set

The MSD 31373 is a direct-fit solution engineered for Big Block Chevy applications using a socket-style distributor cap, making installation straightforward with no trimming or assembly required.