MSD 31653 Super Conductor 8.5mm Spark Plug Wire Set Black Small Block Chevy Socket Cap

The MSD 31653 is a custom-fit, 8.5mm Super Conductor spark plug wire set engineered specifically for Chevy small block engines equipped with a socket-style distributor cap. Designed to maximize ignition performance, these wires route over the valve covers and deliver an exceptional combination of ultra-low resistance and superior EMI suppression in a single plug wire set.

Ultra-Low Resistance Technology:

At the heart of the Super Conductor design is a copper alloy conductor wound extremely tight around a special center core — over 40 feet of conductor material packed into every single foot of wire. The result is only 40–50 ohms of resistance per 12 inches, the lowest of any helically wound wire. Less resistance means less energy loss between the ignition system and the spark plug, delivering a stronger, more consistent spark.

Superior EMI/RFI Suppression:

The tight helical winding combined with a ferro-magnetic impregnated center core creates an effective electromagnetic interference (EMI) choke, providing RFI suppression equivalent to a 1,500-ohm wire — without sacrificing conductivity. EMI stays inside the wire where it cannot interfere with sensitive vehicle electronics, radios, or data systems.

Durable Construction:

The outer jacket is constructed from a proprietary blend of silicone and synthetic material, providing excellent resistance to high heat, abrasion, and tearing. An extra-heavy glass braid and dielectric insulator beneath the jacket keeps voltage on track to the plugs.

Key Features:

• Wire Diameter: 8.5mm
• Color: Black with gray silicone boots
• Conductor Style: Spiral/helical core copper alloy
• Resistance: 40–50 ohms per foot (lowest of any helically wound wire)
• Boot Type: 90-degree spark plug boots; 90-degree socket (female) distributor boots
• Terminals: Dual Crimp stainless steel — separate crimps for sleeve and conductor
• Routing: Over valve covers
• Coil Wire: Included
• Distributor Cap Style: Socket (female) cap compatible
• Sold: As a complete set with cylinder ID markers
• Emissions: Legal for use on emissions-controlled, non-emissions-controlled, and race-only vehicles

Each set includes clip-on cylinder markers for easy wire identification during installation. Pre-cut to exact lengths for a true bolt-on fit, the MSD 31653 is an ideal upgrade for street performance builds and weekend racers running Chevy small block V8 engines with socket-style distributor caps.