Race-Fit 409 Plug Wire Red SBC HEI Under Header

The Race-Fit 409 Plug Wire Red SBC HEI Under Header spark plug wire set from Taylor/Vertex is a high-performance ignition system designed specifically for small-block Chevy engines running HEI distributors. This 10.4 mm spiral core wire set delivers the controlled heat dissipation and signal clarity that serious bracket racers and street performance builders demand when precision ignition timing is critical to horsepower output and reliability.

The spiral core construction minimizes electromagnetic interference and ensures consistent spark delivery across the rev range, essential in high-compression or nitrous-equipped small-block applications where ignition stability directly affects performance. The 90-degree plug boots provide clearance in tight engine bays, while the under-header routing keeps wires away from exhaust heat. HEI terminal compatibility ensures proper contact with modern HEI cap assemblies. Red color coding aids quick visual identification during tuning and diagnostics.

This wire set suits small-block Chevy racers and performance enthusiasts building 350, 383, or 408-cubic-inch engines where header clearance and ignition reliability matter. It's commonly specified in bracket racing, street rod, and boost applications where repeatability and heat resistance are non-negotiable. The 409 designation indicates compatibility with SBC combustion chambers and modern HEI ignition systems.

Taylor/Vertex plug wires have long been a category standard in performance racing, known for consistent manufacturing and reliable ignition performance under sustained high-RPM operation where inferior wires fail or drift out of specification.