Ultra 40 Plug Wire Set - LS1- Sleeved

The MOROSO Ultra 40 Plug Wire Set – LS1 – Sleeved is purpose-built for GM LS-series engine platforms that demand reliable ignition performance and factory-correct fitment. This spark plug wire set serves enthusiasts and technicians who need OEM-style replacement wiring without compromising electrical integrity or appearance. Whether you're restoring a classic LS1 installation, replacing worn factory wires, or building a street engine, this wire set delivers the dependability expected from a trusted performance brand.

The Ultra 40 design features a 7 mm spiral-core conductor that resists electromagnetic interference while maintaining consistent spark delivery across all cylinders. The sleeved construction provides both protection from heat and abrasion, extending wire lifespan in engine compartments where temperatures and vibration are constant concerns. Factory-style boots and terminals ensure plug-to-coil connections mirror original specifications, eliminating fitment guesswork and compatibility issues. With 12-inch wire lengths and blue sleeving for visibility and aesthetics, this seven-wire kit meets exacting OEM standards while maintaining the visual appeal LS enthusiasts expect.

LS1 owners—whether running stock configurations or modified street builds—benefit most from this wire set's plug-and-play design and proven construction quality. Installation requires no special tools or adapters; the factory-style boots connect directly to your ignition coil pack and spark plugs without modification. This kit is ideal for preventive maintenance, engine swaps, or performance builds where spark timing precision and electrical noise reduction matter. The compact packaging (9.4 x 3.8 x 9.4 inches) makes handling easy, and the 1.9 lb weight keeps underhood clutter minimal.