MSD 31239 Super Conductor Spark Plug Wire Set 8 Cyl 90?: Plug, Socket/HEI Cap is a high-quality replacement spark plug engineered for reliable ignition performance and durability. It features a solid copper or nickel electrode design that promotes efficient heat dissipation and consistent spark delivery.

Built with a high-grade ceramic insulator and corrosion-resistant shell, this plug resists fouling and carbon buildup while operating effectively across a wide heat range. Cold-rolled threads and precise construction help prevent damage during installation.

Ideal for maintaining engine efficiency, smoother idle, and reliable starts in compatible vehicles or equipment. A trusted choice for routine maintenance and performance-minded replacements.