MSD 31859 Super Conductor 8.5mm Spark Plug Wire Set AMC V8

The MSD 31859 Super Conductor Spark Plug Wire Set is a custom-fit, high-performance ignition wire set engineered specifically for AMC V8 engines, including the 290, 304, 343, 360, 390, and 401 cubic-inch displacements. Finished in red with 8.5mm diameter construction, these wires deliver maximum spark energy transfer with industry-leading EMI suppression.

Ultra-Low Resistance Core Technology:

At the heart of the Super Conductor wire is a tightly helically wound copper alloy conductor wrapped around a ferro-magnetic impregnated center core. Each 12-inch length contains only 40–50 ohms of resistance — the lowest of any helically wound wire on the market — while simultaneously delivering RFI suppression equivalent to a 1,500-ohm wire. Over 40 feet of conductor is packed into every single foot of finished wire, ensuring maximum voltage reaches the spark plug on every firing event.

Key Features:

• 8.5mm diameter spiral-core wire construction for superior performance
• 40–50 ohms resistance per foot — lowest of any helically wound wire
• Ferro-magnetic impregnated center core creates an effective EMI choke to prevent interference with onboard electronics
• Copper alloy conductor for excellent voltage-carrying capability and minimal energy loss
• Proprietary silicone/synthetic blend outer sleeve provides high resistance to heat, abrasion, and tears
• Dual Crimp stainless steel terminals — one crimp secures the sleeve, a second crimp independently locks onto the conductor for a reliable connection
• 90° socket (female) distributor boots and straight multi-angle spark plug boots
• Red finish for a clean, performance look under the hood
• Custom fit for AMC V8 engines: 290, 304, 343, 360, 390, and 401 cu. in.
• Requires an MSD 6, 7, or 8-series ignition system

Sold as a complete set, the MSD 31859 is a direct bolt-on upgrade that delivers measurably better spark delivery, cleaner ignition signal, and reliable suppression of radio frequency interference — making it the ideal choice for any AMC V8 performance or restoration build.