MSD 31239 Super Conductor Spark Plug Wire Set, 8 Cyl, 90° Plug/Socket, HEI Cap


  • Universal set
  • For engines with early type (socket) and late type (HEI “spark plug top”) distributor caps
  • Extra long 8.5mm red wires
  • Build it the way you want it
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SKU: MSD31239 Categories: ,

Routing spark plug wires is an art form. It takes patience and time to route your wires away from the headers, through separators and to the distributor cap. Some wire sets fit perfect, but a lot of people want to build their own so they can route them exactly how they see fit.

Our Universal spark plug wire sets come with the spark plug terminal and boot installed with the other end open. Distributor cap boots and terminals are included so you can cut the wire to the desired length, then install the terminal with the supplied Mini-Stripper-Crimper. It’s a little more work, but in the end it will be worth it.


  • (8) extra long 8.5mm red wires
  • (8) HEI boots and terminals
  • (8) 90° socket boots and terminals
  • Mini-Stripper-Crimper
Weight 2.85 lbs
Dimensions 11 × 2.8 × 9.9 in



Manufacturer Part Number


MSD Super Conductor Spark Plug Wire Set

8 Cyl; 90ᄚ Plug, Socket; HEI Cap

For engines with early type (socket) and late type (HEI “spark plug top”) distributor caps.

Prop65WARNING: These auto parts can expose you to chemicals including phthalates and lead. Installing or using these parts can expose you to other parts containing these chemicals and to engine exhaust, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to