HEI 8.5 Coil Wire - Red 18in Long

The HEI 8.5 Coil Wire - Red 18in Long from MSD IGNITION is a premium ignition component designed for engine builders, performance enthusiasts, and mechanics working on high-output ignition systems. This coil wire serves as the critical link between your distributor cap and ignition coil, carrying high-voltage current that initiates spark plug firing. Whether you're tuning a carbureted street engine, drag racing setup, or restoring a classic muscle car, this 18-inch coil wire provides the reliability and signal integrity needed for consistent ignition performance across a wide RPM range.

MSD's HEI 8.5 coil wire features a thick, durable construction with a diameter of 8.5mm that minimizes electromagnetic interference and voltage loss—critical factors when running high-performance distributors. The bright red jacket provides easy identification during engine bay work and resists degradation from heat, oil, and UV exposure common in modified engine compartments. The conductor is designed to handle the elevated voltage demands of plasma-core ignition systems without arcing or signal dropout under load.

This HEI 8.5 coil wire fits any HEI-based ignition system, including factory retrofits and aftermarket performance distributors. Its 18-inch length accommodates most HEI distributor layouts without requiring custom routing, allowing flexibility for various mounting positions. This makes it an excellent choice for those looking to enhance their ignition systems for improved performance.