MSD 31323 8.5mm Super Conductor Spark Plug Wire Set Ford 302 351W HEI Black

The MSD 31323 Super Conductor 8.5mm Spark Plug Wire Set is a custom-fit, direct-replacement ignition wire set engineered specifically for Ford small-block 302 and 351W engines equipped with HEI-style distributor caps. Designed from the inside out for maximum spark delivery, these wires combine ultra-low resistance with exceptional EMI suppression in a single high-performance package.

At the core of the Super Conductor design is a helically wound copper alloy conductor that delivers just 40–50 ohms of resistance per foot — the lowest of any spiral-wound wire — while providing RFI suppression equivalent to a 1,500-ohm wire. Over 40 feet of conductor is tightly wound into every single foot of finished wire, and a ferro-magnetic impregnated center core creates a powerful EMI choke that keeps interference contained inside the wire where it cannot disrupt other vehicle electronics.

Key Features:

• 8.5mm diameter spiral-core construction for superior conductivity and durability
• 40–50 ohms/foot resistance — delivers maximum spark energy to the plugs
• Ferro-magnetic impregnated center core for highly effective EMI/RFI suppression
• Proprietary silicone/synthetic outer jacket resists high heat, abrasion, and tearing
• Extra-heavy glass braid and dielectric insulator beneath the jacket
• Dual crimp stainless steel terminals with snap-lock retention under high-temperature boots
• Multi-angle boots designed for HEI-style distributor caps
• Includes clip-on cylinder number markers for easy identification
• Custom fit for Ford small-block 302 and 351W applications with HEI distributor
• Black jacket finish
• Sold as a complete set

These wires are emissions-legal for use on controlled and uncontrolled vehicles and are a direct bolt-on upgrade that ensures reliable, full-strength ignition performance for your Ford small-block build.