MSD 31773 Super Conductor Spark Plug Wire Set Big Block Chevy HEI - Black 8.5mm

The MSD 31773 Black Super Conductor 8.5mm Spark Plug Wire Set is a vehicle-specific, bolt-on ignition upgrade engineered for Big Block Chevy engines equipped with HEI distributors (1975 and later). Delivering the best of both worlds — ultra-low resistance and superior EMI suppression — this wire set ensures maximum spark energy reaches the plugs every time.

Key Features:

• Ultra-Low Resistance: Only 40–50 ohms of resistance per 12 inches — the lowest of any helically wound wire — maximizing spark energy delivery to the plugs
• Copper Alloy Helical Conductor: Over 40 feet of tightly wound copper alloy conductor is packed into every single foot of wire for outstanding voltage transfer
• Ferro-Magnetic EMI Choke: The helical winding combined with a ferro-magnetic impregnated center core creates a highly effective EMI/RFI suppression choke, keeping interference contained within the wire and away from sensitive vehicle electronics
• 8.5mm Diameter: Heavy-duty 8.5mm construction with a proprietary silicone and synthetic blend outer sleeve that resists high heat, abrasion, and tearing
• Dual Crimp Terminals: MSD's exclusive Dual Crimp spark plug terminals feature two separate crimps — one securing the wire sleeve, and a second securing the conductor — for a robust, reliable connection
• HEI-Specific Fitment: Designed specifically for Big Block Chevy engines with HEI-style distributor caps (1975 and later); wires are pre-cut to exact lengths for a direct bolt-on installation
• Black Jacket Finish: Clean, stealthy black silicone/synthetic jacket for a professional under-hood appearance

The MSD 31773 wire set is the ideal choice for Big Block Chevy owners looking to extract every bit of ignition performance from their HEI system. Pre-cut lengths eliminate guesswork, making installation straightforward and clean.