MSD 31413 Super Conductor 8.5mm Spark Plug Wire Set Black SB Chevy Truck

The MSD 31413 Black Super Conductor Spark Plug Wire Set is a custom-fit, bolt-on ignition upgrade engineered specifically for Small Block Chevy (305/350) trucks with factory HEI distributors from 1985 onward. Delivering maximum spark energy to the plugs with minimal interference, these 8.5mm wires represent the top tier of helically wound ignition wire technology.

Superior Conductivity: At the heart of the Super Conductor design is a copper alloy conductor wound with extraordinary density — over 40 feet of conductor material is packed into every single foot of finished wire. The result is just 40–50 ohms of resistance per 12-inch length, making it the lowest resistance of any helically wound spark plug wire available.

Built-In EMI/RFI Suppression: The tight winding pattern, combined with a ferro-magnetic impregnated center core, creates a highly effective Electro Magnetic Interference (EMI) choke. This suppression capability keeps EMI and RFI contained within the wire, protecting sensitive onboard electronics — with RFI suppression equivalent to a 1,500-ohm wire.

Key Features:

• 8.5mm diameter spiral core construction for maximum conductivity and durability
• 40–50 ohms resistance per foot — lowest of any helically wound wire
• Ferro-magnetic impregnated center core for effective EMI/RFI suppression
• Proprietary silicone/synthetic blend jacket — highly resistant to high heat, abrasion, and tearing
• Dual Crimp stainless steel terminals — one crimp on the sleeve, one on the conductor, for a secure and reliable connection
• 90-degree plug boots with high-temperature construction
• HEI-style distributor terminal — matches factory HEI cap
• Snap-lock terminals under high-temp boots for a firm, rattle-free fit
• Includes clip-on cylinder markers for easy wire identification
• Custom fit for Small Block Chevy 305/350 V8 trucks with HEI, 1985–1995
• Sold as a complete set

The MSD 31413 is the performance upgrade that delivers every volt of spark energy to where it matters most — while keeping interference away from modern engine management electronics. A direct, no-modification-required installation makes this a true bolt-on performance improvement.