MSD 31363 Super Conductor Spark Plug Wire Set Big Block Chevy HEI - 8.5mm Black

The MSD 31363 Super Conductor Spark Plug Wire Set is a precision-engineered, custom-fit 8-wire set designed for Big Block Chevy applications with HEI distributors. Built around MSD's legendary 8.5mm Super Conductor technology, these wires deliver maximum spark energy to your plugs while keeping harmful electromagnetic interference locked inside the wire where it belongs.

At the heart of each wire is a tightly wound copper alloy spiral core that achieves only 40?50 ohms of resistance per foot ? the lowest of any helically wound wire on the market. Over 40 feet of conductor is packed into every single foot of finished wire, and when combined with a ferro-magnetic impregnated center core, the result is an exceptionally effective EMI choke that suppresses radio frequency interference (RFI) to a level equivalent to a 1,500-ohm resistor wire ? without sacrificing spark energy.

The outer jacket is constructed from a proprietary blend of silicone and synthetic materials, delivering outstanding resistance to high heat, abrasion, and tears. An extra-heavy glass braid and strong dielectric insulator further protect wire integrity under demanding conditions. Gray silicone boots are featured at both the spark plug and distributor ends, and the set uses a male HEI-style distributor terminal to mate cleanly with factory and aftermarket HEI distributors.

Key Features:

• 8.5mm diameter spiral core wire construction
• 40?50 ohms/ft resistance ? lowest of any helically wound wire
• RFI suppression equivalent to a 1,500-ohm wire
• Copper alloy conductor for superior voltage transfer
• Ferro-magnetic impregnated center core for EMI choke effect
• Proprietary silicone/synthetic outer jacket ? heat, abrasion, and tear resistant
• Extra-heavy glass braid with strong dielectric insulation
• Gray silicone spark plug boots ? eight multi-angle straight ends
• Gray silicone distributor boot with male HEI terminal
• Dual Crimp terminals for a secure, low-resistance connection
• Black wire jacket finish
• Sold as a complete 8-wire set; coil wire not included
• Legal for use on emissions-controlled and non-emissions-controlled vehicles

MSD 31363 wires are a direct-fit performance upgrade that replaces worn or underperforming factory wires, ensuring every spark reaches the plug at full strength for improved throttle response and engine efficiency.