MSD 31233 Super Conductor Universal Spark Plug Wire Set - 8.5mm 8-Cylinder 90 Black

The MSD 31233 Super Conductor Universal Spark Plug Wire Set is a premium 8.5mm wire set designed for 8-cylinder engines, giving you the flexibility to build a custom-routed ignition wire set tailored to your exact engine bay layout. The wires come with 90° boots and terminals pre-installed on the spark plug end, while the distributor end is left open so you can cut each wire to your desired length before crimping the included terminals.

At the heart of every Super Conductor wire is MSD's industry-leading helically wound copper alloy conductor, which delivers only 40–50 ohms of resistance per foot — the lowest of any helically wound wire — while providing RFI suppression equivalent to a 1,500-ohm wire. Each foot of finished wire contains over 40 feet of tightly wound conductor material for exceptional spark energy transfer.

Key Features:

• Ultra-low resistance: Only 40–50 ohms per foot for maximum spark energy delivery to the plugs
• EMI/RFI suppression: Ferro-magnetic impregnated center core creates an effective electromagnetic interference choke, keeping interference inside the wire
• 8.5mm construction: Tough synthetic/silicone outer jacket over extra-heavy glass braid and dielectric insulator for superior heat and abrasion resistance
• Dual-compatibility terminals: Includes terminals for both early-type (socket) and late-type (HEI spark plug top) distributor caps
• 90° boots factory-installed: Pre-installed on the spark plug end for immediate use; distributor end left open for custom length cutting
• Stainless steel terminals: Dual crimp design with snap-locks underneath high-temperature boots for a secure, rattle-free connection
• Cylinder ID markers: Clip-on cylinder number markers included for easy wire identification
• Includes Mini-Stripper-Crimper: MSD's specialty tool included for clean, factory-style crimps on the distributor end terminals
• Extra-long wires: Wires are supplied long so they can be trimmed to fit virtually any 8-cylinder engine configuration

This universal set is an ideal solution for custom engine builds, engine swaps, or anyone who wants precise control over wire routing. Compatible with both socket-style and HEI-style distributor caps, the MSD 31233 covers a wide range of 8-cylinder applications in a single kit.