Ultra 40 Wire Set 8.5mm GM LS/LT 11.0 Black

The MOROSO Ultra 40 Wire Set 8.5mm is a spiral-core spark plug wire kit engineered specifically for GM LS and LT-series engines. This black wire set delivers the suppression and signal integrity needed for reliable ignition across high-performance and stock applications, featuring straight plug boots, a coil-style terminal, and 8.5mm core construction designed to minimize electromagnetic interference while maintaining consistent spark delivery under varying engine loads.

The 8.5mm spiral-core wire diameter provides a balance between noise suppression and electrical conductivity, critical for modern LS/LT engines where electronic control modules are sensitive to ignition timing feedback. The straight plug boots ensure a secure seated fit at the spark plug, reducing the risk of arcing or moisture intrusion—a common failure point in engine bays exposed to heat cycling and vibration. The coil-style terminal accommodates stock and many aftermarket coil packs used in these engine families, allowing for straightforward installation without adapter components.

This wire set serves both street and weekend track applications where owners demand consistent spark delivery without the cost of premium racing harnesses. Chevrolet LS and LT swaps into independent platforms, restorations, and stock performance builds benefit from this proven design. The kit format eliminates guesswork during ignition system maintenance, pairing quality wire construction with the correct terminal and boot configuration for these engine platforms.

MOROSO's reputation in performance ignition components reflects decades of OEM and racing development, making this wire set a direct fit solution for LS/LT engine builders seeking reliable ignition without complexity.