Ultra 40 Spark Plug Wire Set - BBC HEI 135-Deg

The Ultra 40 Spark Plug Wire Set - BBC HEI 135-Deg from MOROSO is engineered specifically for big block Chevy engines equipped with HEI ignition systems. This complete wire set addresses a critical need for engine builders and performance mechanics: reliable spark delivery under header clearance constraints. When running headers on a big block installation, standard wire routing becomes impossible—these 135-degree boots solve that geometry problem while maintaining the electrical integrity your engine demands.

Built with a spiral core construction and 8.65 mm diameter, the Ultra 40 wire set delivers superior EMI suppression and consistent spark timing across all eight cylinders. The spiral core design reduces radio frequency interference and engine noise while maintaining low resistance for optimal voltage delivery to each plug. The 135-degree boot angle is the engineering solution that lets headers clear the spark plug connections without compromise—a critical detail for serious BBC builds where even slight interference can force costly redesigns. MOROSO's manufacturing standards ensure uniform wire length and boot fit, eliminating the weak points found in budget alternatives.

This wire set is essential for big block Chevy owners running aftermarket headers—particularly those with aggressive tube routing that conflicts with traditional vertical boot orientation. Whether you're building a street performance engine, a dedicated race car, or restoring a classic with modern ignition upgrades, the under-header design clears the obstruction without compromising spark quality. The complete kit (SKU MOR73729) eliminates guesswork in wire selection and ensures all eight cylinders receive matched components for balanced combustion. Installation is straightforward for anyone with basic mechanical knowledge, and the proven MOROSO reputation means these wires will support reliable starts and consistent performance through seasons of driving.