Ultra 40 Plug Wire Set Black w/Sleeves

The MOROSO Ultra 40 Plug Wire Set in Black with Sleeves (MPN 73848) is a high-performance ignition system engineered for GM LS-Series engines requiring precision spark timing and reliable fire. This plug wire kit features a spiral core construction at 7mm diameter designed to minimize electromagnetic interference while delivering consistent energy to each cylinder. The 45-degree plug boots and HEI/socket-style connectors ensure secure, corrosion-resistant connections that hold firm under engine vibration and thermal cycling.

Built for race and high-output applications, the Ultra 40 construction provides superior heat dissipation and signal integrity compared to standard ignition wires. The black finish with protective sleeves resists abrasion, oil degradation, and UV damage in engine bay environments. The 7mm spiral core is optimized for LS-platform fuel injection systems where clean, noise-free ignition signals are critical for engine management computer tuning and idle stability. The 45-degree boot angle accommodates the tight spark plug spacing found on LS cylinder heads without kinking or fouling adjacent components.

This wire set is intended for LS engine swaps, street performance builds, and race applications where OEM wire durability may fall short of sustained high RPM operation. The HEI/socket connector type works with GM LS distributors and aftermarket LS ignition systems using standard cap-and-rotor or hybrid electronic distributors. Proper installation requires inspection of all boot seals and secure seating on spark plugs to prevent misfires. The complete kit includes all wires needed for a full eight-cylinder LS engine.