Ultra 40 Plug Wire Set BBC HEI - Blue

The MOROSO Ultra 40 Plug Wire Set BBC HEI in blue is a race-grade spark plug wire kit engineered for big block Chevy engines equipped with HEI or socket-style distributors. Built with 8.65 mm spiral core construction, this complete plug wire set delivers the suppression characteristics and signal integrity required for high-performance engine management, whether on the dyno, drag strip, or street application.

The 90-degree plug boots provide secure, reliable connections at the spark plug end while maintaining proper geometry within tight engine bay configurations common to big block installations. The 8.65 mm spiral core design minimizes EMI and RFI interference, critical for modern fuel injection systems and ignition computers that demand stable spark timing. MOROSO's Ultra 40 series represents purpose-built wiring for engine builders and enthusiasts who prioritize ignition signal clarity and repeatability across the RPM range. The blue jacket offers both visual identification during engine work and UV resistance for long-term underhood durability.

This kit addresses the needs of big block Chevy platform builders—from competition engines requiring maximum ignition reliability to street applications where suppressed noise and clean electrical performance matter. The HEI compatibility ensures drop-in fitment with original and modern HEI distributor installations, eliminating compatibility guesswork during assembly or upgrades.

Weighing 2.33 pounds and sized for standard underhood routing, the wire set integrates efficiently into existing engine dress-up and management systems without requiring harness extensions or custom adapters.