Built for high-current magneto ignition systems, this MSD 8.5mm Super Conductor wire set uses a copper alloy conductor that handles the magneto's voltage better than stainless steel while keeping resistance low. The conductor is tightly wound around a ferro-spiral core to choke off EMI, and the silicone sleeve resists high heat and abrasion, delivering the strongest spark possible in a close-fit Small Block Chevy sprintcar application.
Specifications:
- Brand: MSD
- Product Type: Spark Plug Wire Set
- Application: Small Block Chevy, Sprintcar close fit
- Wire Diameter / Outside Diameter: 8.5mm
- Color / Insulation Color: Black
- Conductor Core: Ferro-Spiral copper alloy
- Boot Material: Silicone
- Boot Type / Spark Plug Boot Angle: 90 degrees
- Resistance: 40-50 Ohms Per Foot
- Sleeved: No
- Wire Series: 8.5 Super Conductor
- Warning: California Proposition 65
- Part Number: 31543
Compliance: This part is legal for sale and use on Racing Use Only Vehicles — competition vehicles that are not registered and never operated on the street. It is against the law to install this part on an Emissions Controlled Vehicle (1966-and-newer California-certified or 1968-and-newer federally certified vehicles).
FAQ
Is this wire set legal for street use?
No. This part is legal for sale and use on Racing Use Only Vehicles — competition vehicles that are not registered and never operated on the street. It is against the law to install this part on an Emissions Controlled Vehicle (1966-and-newer California-certified or 1968-and-newer federally certified vehicles).
What application is this wire set built for?
It's a close-fit 8.5mm Super Conductor wire set for Small Block Chevy sprintcar applications using a 90-degree boot.
Why is the copper alloy conductor used with a magneto?
The special copper alloy conductor is strong enough to handle the high current and voltage of a magneto and is a better conductor than stainless steel, while retaining high EMI suppression.
What is the boot angle on this wire set?
Both the spark plug and cap boots are set at a 90-degree angle for a close fit.

