MSD 31159 Super Conductor 8.5mm Universal Spark Plug Wire Set 4-Cylinder Multi-Angle Socket/HEI

The MSD 31159 Super Conductor Spark Plug Wire Set is a universal, cut-to-fit 8.5mm wire set designed for 4-cylinder engines equipped with either early-style socket or late-style HEI distributor caps. This set arrives with multi-angle spark plug boots and terminals pre-installed on the plug end, leaving the distributor end open so you can cut each wire to your exact routing length and crimp on the included terminals.

At the heart of the Super Conductor design is a helically wound copper alloy core with less than 40–50 ohms of resistance per foot — the lowest resistance of any helically wound wire — so more spark energy reaches the plug rather than being lost in the wire. Each foot of finished wire packs over 40 feet of tightly wound conductor around a ferro-magnetic impregnated center core, creating a highly effective EMI choke that keeps electromagnetic interference contained inside the wire and away from sensitive vehicle electronics.

The outer jacket is a tough proprietary blend of silicone and synthetic material over an extra-heavy glass braid, delivering exceptional resistance to high heat, abrasion, and tearing. Beneath the high-temperature silicone boots, dual-crimp stainless steel terminals grip both the wire conductor and outer jacket independently for a rock-solid, snap-lock connection.

Key Features:

• Universal cut-to-fit design for 4-cylinder engines
• 8.5mm diameter, red spiral-core wire
• 40–50 ohms/ft resistance with RFI suppression equivalent to a 1,500-ohm wire
• Ferro-magnetic impregnated center core for effective EMI choke
• Silicone/synthetic outer jacket with extra-heavy glass braid insulation
• Multi-angle spark plug boots and terminals pre-installed on plug end
• Includes both socket-style and HEI spark-plug-style distributor cap boots and terminals
• Dual-crimp stainless steel snap-lock terminals
• Includes MSD Mini-Stripper-Crimper tool for custom termination
• Wire lengths included: 1 × 40", 2 × 36", 1 × 30", plus a 32" coil wire
• Legal for use on emissions-controlled and non-emissions-controlled vehicles

The MSD 31159 is ideal for builders who want total control over wire routing — whether navigating around headers, through separators, or across a tight engine bay. The included Mini-Stripper-Crimper makes it straightforward to finish each wire at the bench before installation.