MSD 31833 Black Super Conductor 8.5mm Spark Plug Wire Set with HEI 90-Degree Boots

The MSD 31833 Super Conductor 8.5mm Spark Plug Wire Set is a custom-fit, vehicle-specific ignition wire set designed for small block Chevrolet engines equipped with an HEI distributor. Built with MSD's signature Super Conductor technology, these wires deliver maximum spark energy to the plugs while keeping electromagnetic interference (EMI) completely in check.

Ultra-Low Resistance Construction:

• Only 40–50 ohms of resistance per foot — the lowest of any helically wound wire on the market
• Copper alloy conductor tightly wound around a special center core — over 40 feet of conductor packed into every single foot of finished wire
• Ferro-magnetic impregnated center core creates a highly effective EMI choke, keeping interference inside the wire and away from sensitive vehicle electronics
• RFI suppression equivalent to a 1,500-ohm wire, with none of the energy loss

Premium Outer Construction:

• 8.5mm diameter jacket made from a proprietary blend of silicone and synthetic material
• Highly resistant to high heat, abrasion, and tearing
• Extra-heavy glass braid and dielectric insulator layer guides current directly to the plugs

Terminals & Boots:

• Dual Crimp stainless steel terminals — one crimp secures the wire sleeve, a second separate crimp locks onto the conductor itself for a rock-solid connection
• High-temperature boots with snap-lock terminals ensure a secure, rattle-free fit
• 90-degree plug boots compatible with HEI-style distributors (male post)

Additional Details:

• Wire color: Black
• Conductor style: Spiral/helical core
• Spark plug boot material: Silicone
• Includes clip-on cylinder number markers for easy identification
• Legal for use on emissions-controlled, non-emissions-controlled, and racing vehicles

The MSD 31833 is a direct, bolt-on performance upgrade that replaces factory spark plug wires with a set engineered for more complete combustion, improved throttle response, and reliable ignition performance.