MSD 31609 Super Conductor 8.5mm Spark Plug Wire Set Big Block Chevy Socket Distributor Cap

The MSD 31609 Race Tailored 8.5mm Super Conductor Spark Plug Wire Set is engineered specifically for Big Block Chevy race engines running headers and equipped with a socket-style distributor cap. Each wire in this set is custom cut to route cleanly behind the block and under the headers, delivering a tidy engine bay appearance while keeping wires safely away from heat and contact points.

At the heart of this set is MSD's patented Super Conductor technology — a copper alloy conductor wound into a helical spiral that achieves less than 50 ohms of resistance per foot, while delivering RFI suppression on par with a 1,500-ohm wire. In fact, each finished foot of wire contains 40 feet of tightly wound conductor, creating a highly effective electromagnetic interference (EMI) choke that shields sensitive electronics from ignition noise without sacrificing spark energy delivery.

Key Features:

• Ultra-low resistance: Copper alloy conductor delivers less than 50 ohms per foot for maximum spark energy transfer
• Superior EMI/RFI suppression: Ferro-magnetic impregnated core with helically wound conductor keeps interference contained inside the wire
• Dupont Kevlar reinforced core: Increases tensile strength and long-term durability
• 40:1 winding ratio: Forty feet of conductor wound into each single foot of finished wire for exceptional EMI suppression
• Durable 8.5mm outer sleeve: Proprietary compound construction resists high heat and abrasion
• Heavy glass braid & dielectric insulator: Keeps current on track from coil to plug
• Silicone boots: Gray silicone distributor and spark plug boots with 90-degree plug ends
• Dual Crimp stainless steel terminals: Grip both the wire conductor and outer jacket independently for a secure, lasting connection
• Race Tailored fit: Wires route below the header/exhaust manifold for a clean, professional installation

The MSD 31609 wire set features spiral core construction, female/socket distributor terminal ends, and is compatible with MSD socket-style distributor caps. It carries RFI suppression and is emissions-legal for controlled, uncontrolled, and race-use vehicles. For a finishing touch, MSD Pro-Clamp wire separators (sold separately) can be used to keep the wires neatly organized and protected from engine heat sources.