JavaScript Disabled

Your JavaScript appears to be disabled. JavaScript is necessary for various functions, such as order checkout, to operate on this web site. Please ensure that JavaScript is enabled.

Outdated Internet Browser Detected

Your web browser appears to be out of date. Soon you will not be able to create a secure connection to our web site using TLS 1.0. Please upgrade your browser from current version( ). Learn more about TLS.

In-Store Pickup Location

MSD 8.5mm Super Conductor Spark Plug Wire Sets 31223

MSD Ignition 31223 - MSD 8.5mm Super Conductor Spark Plug Wire Sets
  • Summit Racing Assembling Custom Spark Plug Wires

    Summit Racing Assembling Custom Spark Plug Wires

  • Custom MSD Spark Plug Wires

    Custom MSD Spark Plug Wires

  • How to Crimp Your MSD Plug Wires

    How to Crimp Your MSD Plug Wires

  • MSD 8.5mm Super Conductor Plug Wire Sets

    MSD 8.5mm Super Conductor Plug Wire Sets

  • << Previous photo
  • Next photo >>

Now Playing: Summit Racing Assembling Custom Spark Plug Wires

Loading media

In progress

Spark Plug Wires, Super Conductor, Spiral Core, 8.5mm, Black, 90 Degree Boots, Universal, L8/V8, Set

Estimated Ship Date: Loading...Processing Monday 6/17/2019 Would you rather pick it up? Select Location

  • Order this item and get free delivery and handling on your entire order! Offer excludes truck freight and oversize fees. Valid on orders shipped in the contiguous United States.

Hazardous Material Warning
WARNING: Cancer and Reproductive Harm For more information, visit

Brand: MSD Ignition

Manufacturer's Part Number: 31223

Part Type: Spark Plug Wire Sets

Product Line: MSD 8.5mm Super Conductor Spark Plug Wire Sets

Summit Racing Part Number: MSD-31223

UPC: 085132312238

Assembled: No

Distributor Terminal Ends: Male/HEI

Distributor Boot Color: Gray

Distributor Boot Material: Silicone

Spark Plug Boot Ends: Eight 90 degree

Spark Plug Boot Color: Gray

Spark Plug Boot Material: Silicone

Wire Color: Black

Diameter (mm): 8.50mm

RFI Suppression: Yes

Coil Wire Included: Yes

Conductor Style: Spiral core

Spark Plug Wire Resistance: 50 ohms/ft.

Quantity: Sold as a set.

Notes: Includes vice mount wire crimping tool.

In-Store Pickup: Choose In-store pick-up (OH, NV, GA, TX) on our web site.

MSD 8.5mm Super Conductor spark plug wire sets feature a special helically wound core that has just 40-50 ohms of resistance per foot—but with an RFI suppression equal to a 1,500 ohm wire. In fact, each foot of finished wire includes 40 ft. of tightly wound copper for superior conductivity. This winding procedure, combined with a ferro-magnetic impregnated center core, produces an extremely effective Electro Magnetic Interference "choke." This choke, or suppression capability, keeps the EMI inside the wire where it cannot interfere with other electronics on your vehicle. A tough, 8.5mm synthetic/silicone jacket over an extra-heavy glass braid and dielectric insulator keeps the current guided to the plugs. Underneath the high-temperature boots, dual crimp stainless steel terminals feature snap-locks to ensure a secure fit. Each set comes with clip-on cylinder markers for easy identification. MSD's 8.5mm Super Conductor wire sets are available in custom or universal-fit applications.


Questions & Answers Ask a Product Question

Would This Be Good For a 1970 455 Oldsmobile Big Block With an MSD &’ 600+HP ?

Asked by TYRELL on March 08, 2019


Tyrell, typically Oldsmobile 455's use a straight spark plug wire boot on the engine side. This particular wire set has 90° plug boots. A universal set with straight boots on the plug end is part number 31183.

MSD Ignition MSD Ignition Answer - March 11, 2019

Answer This Question


what is the initial length of the wires as if when i was just opening the box? need the wires to be long and not to short

Asked by NICHOLAS on July 26, 2018


The universal wire sets come with wires a foot longer than stock and you will have plenty of wire length to do your application.

DAVID F from TX answered on August 02, 2018

Answer This Question


fit the 305 camaro 91 engine with 565-300 holley distributor? thank you

Asked by LUCAS on May 27, 2019


Lucas, the 31223 wire set will work great for your combination.

MSD Ignition MSD Ignition Answer - May 29, 2019

Answer This Question


What's the best fitment for my 67 elcamino with a 454 big block? Stock them come with 8mm spark plug wires...

Asked by ROGER on November 07, 2018


Roger, the 31223 universal wire set will work great for your big block El Camino. If you are looking for a pre-built set the closest we will have is part number 31373.

MSD Ignition MSD Ignition Answer - November 08, 2018

Answer This Question

Most Helpful Reviews Review This Product

Some parts are not legal for use in California or other states with similar laws / regulations

Back To Results
Email this page
Sign Up for Email X