8.5mm Wire Set - SBC w/HEI Tower Cap

The MSD IGNITION 8.5mm Wire Set - SBC w/HEI Tower Cap is a complete spark plug wire kit engineered for Small Block Chevy engines running HEI ignition systems. This super conductor wire set delivers reliable spark delivery across all eight cylinders, making it an essential upgrade for stock restorations, performance rebuilds, and high-RPM applications. Whether you're tuning a classic Chevy muscle car or maintaining a dependable work engine, this wire set ensures consistent ignition performance without voltage loss or cross-fire interference.

Constructed with a 8.5mm spiral core conductor design, this wire set minimizes electromagnetic interference while maintaining superior voltage transmission to the spark plugs. The black 90-degree plug boots provide a secure, weather-resistant connection at each cylinder, while the HEI style terminal ensures proper fit and engagement with your distributor cap tower. The super conductor construction reduces resistance compared to standard copper cores, allowing maximum spark energy to reach the combustion chamber and improving cold-start reliability and throttle response on older and modified engines alike.

This wire kit is ideal for Small Block Chevy applications using HEI distributors, including 265, 283, 302, 305, 327, 350, and 400 cubic inch engines. Installation is straightforward—simply match the wire sequence to your original configuration and route wires away from hot engine surfaces and moving components. The complete 8.5mm wire set arrives ready to install with all terminals and boots included, making it a plug-and-play solution for anyone seeking factory-equivalent or performance-level ignition reliability without the complexity of points conversion or electronic ignition retrofits.