MSD 31329 Super Conductor Spark Plug Wire Set Ford HEI Red - 8.5mm 302 351W

The MSD 31329 is a vehicle-specific Super Conductor 8.5mm spark plug wire set designed for Ford small-block 302 and 351W engines. Each wire is pre-cut to exact length for a clean, bolt-on installation with no trimming required. The set features a distinctive red jacket with straight multi-angle and 90-degree boots to suit a variety of intake and header configurations.

At the core of this wire set is MSD's helically wound copper alloy conductor, which delivers only 40–50 ohms of resistance per 12-inch length — the lowest resistance of any helically wound wire available. More than 40 feet of conductor is tightly wound into every single foot of wire, and combined with a ferro-magnetic impregnated center core, the assembly creates a highly effective EMI (Electro Magnetic Interference) choke that contains interference within the wire and protects sensitive vehicle electronics.

The outer sleeve is constructed from a proprietary blend of silicone and synthetic materials, providing exceptional resistance to high heat, abrasion, and tearing. Terminals use MSD's signature Dual Crimp design — one crimp secures the wire sleeve, while a separate crimp grips the conductor directly — ensuring a reliable, low-resistance connection at every plug.

Key Features:

• 8.5mm Super Conductor wire construction
• 40–50 ohms resistance per 12-inch length — lowest of any helically wound wire
• Copper alloy conductor helically wound over ferro-magnetic center core for EMI suppression
• Dual Crimp terminals for a secure, two-point connection
• Silicone/synthetic outer sleeve — heat, abrasion, and tear resistant
• Straight multi-angle and 90-degree distributor boots included
• Pre-cut wires for exact bolt-on fitment — no trimming required
• Red jacket finish
• HEI-style distributor cap compatible

Wire Lengths Included:

• 1 wire — 23"
• 2 wires — 25"
• 1 wire — 28"
• 1 wire — 31"
• 1 wire — 34"
• 2 wires — 37"
• 2 coil wires — 26"