Product Summary

305, 327, 350, 400, Spiral Core Conductor Style, Red

  • Wires are specifically designed to run below the header/exhaust manifold
  • Features socket/female cap and terminal style
  • Resistance of these wires measures 50 ohms/ft
  • Boots are made from silicone and feature 90-degree turns
  • Set is supplied with two 4-wire, two 3-wire, and four 2-wire separators

Comes as a Kit

Key Specs

MFG. Part #31599 8843

Need To Know

Free Shipping on Orders Over $149

Shipping Policies & FAQs

Quick and Easy Returns

Return Policy


Spark Plug Wires

The MSD 8.5mm Super Conductor is the ultimate performance wire! Its extremely low-resistance combined with the ability to suppress Electro Magnetic Interference is a combination that defies the common laws of physics.

Less resistance means more energy is going to make it to the spark plug to ignite the air/fuel mixture. The Super Conductor uses a copper alloy conductor resulting in less than 50 ohms per foot of wire! This ensures that the most energy possible makes it to the spark plug. By helically winding the conductor around a special core, we are able to produce a highly effective choke to keep the EMI inside the wire and away from other electronics.

This combination is encased in a heavy duty sleeve that will withstand abrasion and high temperatures. Cap off each end with our Dual Crimp Terminals and you have the best wire available.


  • Less than 50 ohms per foot for superior spark
  • Ferro-magnetic impregnated core creates an effective EMI choke
  • Forty feet of conductor is wound into a single foot of wire for high EMI suppression
  • Conductor core features Dupont Kevlar material for increased tensile strength
  • Durable outer sleeve is a proprietary compound for resistance to high heat or abrasion

Learn how to properly attach new spark plug terminals and boots by reading our tech article. How to Install Spark Plug Wire Ends.


Loom Kit

Separate your plug wires to keep them from arcing across one another with these MSD Pro-Clamp wire separators.

Set is supplied with two 4-wire, two 3-wire, and four 2-wire separators.


MFG. Part #31599 8843
Conductor StyleSpiral Core
Cap Terminal StyleSocket / Female
Cap TypeSocket / Female
Spark Plug Wire ColorRed
Spark Plug Boot EndsEight 90 degree
Spark Plug Boot MaterialSilicone
Spark Plug Boot ColorGray
Diameter8.5 mm
RFI SuppressionYes
Distributor Terminal EndsFemale/Socket
Distributor Boot MaterialSilicone
Distributor Boot ColorGray
Coil Wire IncludedYes
Spark Plug Wire Resistance50 ohms/ft.
Sold in QuantityKit