MSD 31383 Black 8.5mm Super Conductor Spark Plug Wire Set Ford 351C-400 Socket

The MSD 31383 is a custom-fit, vehicle-specific 8.5mm Super Conductor Spark Plug Wire Set designed for Ford 351C and 400 engines equipped with a socket-style distributor cap. These wires are pre-cut to exact specifications for a direct bolt-on installation, delivering measurable ignition performance gains without modification.

At the heart of the Super Conductor design is a copper alloy conductor helically wound at extreme density around a special center core — with over 40 feet of conductor packed into every single foot of wire. The result is an industry-leading resistance of just 40–50 ohms per 12 inches, the lowest of any helically wound spark plug wire. Lower resistance means less energy lost in transit and more spark energy delivered directly to the plug.

The dense winding, combined with a ferro-magnetic impregnated center core, creates a highly effective EMI (Electro Magnetic Interference) choke that contains interference inside the wire and prevents it from disrupting sensitive onboard electronics, ignition systems, and engine management components.

The outer jacket is constructed from a proprietary blend of silicone and synthetic material, offering superior resistance to high heat, abrasion, and tears — ideal for the demanding environment of a performance engine bay. Terminals feature MSD's Dual Crimp design, with one crimp securing the wire sleeve and a second crimp grasping the conductor itself for a secure, vibration-resistant connection.

Key Features:

• 8.5mm Super Conductor wire construction
• Ultra-low resistance: 40–50 ohms per 12-inch length
• Copper alloy helically wound conductor
• Ferro-magnetic impregnated center core for EMI suppression
• Silicone/synthetic blend outer jacket — heat, abrasion, and tear resistant
• Dual Crimp terminals for a secure, reliable connection
• Socket-style distributor cap compatible
• Pre-cut and custom fit — direct bolt-on installation
• Black jacket finish

The MSD 31383 wire set is emissions compliant and legal for use on emissions-controlled vehicles, non-emissions-controlled vehicles, and racing applications.