Ultra 40 Plug Wire Set GM LS 12in 135-Degree

The Ultra 40 Plug Wire Set GM LS 12in 135-Degree by MOROSO is purpose-built for GM LS-series engine swaps and high-performance builds where routing space is critically tight. Whether you're fitting an LS engine into a classic car, street rod, or performance truck, these specialized ignition wires solve the real-world problem of navigating tight engine compartments without sacrificing spark delivery. MOROSO engineered this set specifically for builders who refuse to compromise between compact design and reliable ignition performance—eliminating the guesswork of custom wire routing and potential misfires caused by poor conductor contact or inadequate shielding.

These plug wires feature MOROSO's Ultra 40 construction, a proven ignition wire technology that delivers consistent, high-voltage spark transmission with superior EMI suppression—critical for modern engine management and dyno-validated performance. The 135-degree boot angle on each terminal is precision-molded to direct wires away from exhaust manifolds, intake runners, and other obstacles common in tight LS swaps, reducing risk of heat damage and wire degradation over time. The 12-inch overall length is optimized for compact engine compartments while maintaining proper conductor geometry; shorter wires eliminate slack and potential arcing points while the core construction provides reliable conductivity across extended operating temperatures and high-RPM demand.

This set is essential for anyone performing an LS engine conversion, upgrading to LS power in a tight chassis, or rebuilding a performance ignition system where factory harnesses don't fit. Technicians and enthusiasts working on truck swaps, hot rods, race cars, and engine transplants benefit most from the thoughtful engineering that prevents common installation headaches. Ensure your LS ignition system maintains spark integrity under all load conditions—MOROSO's track record speaks to reliability on both street and strip applications where engine management precision directly impacts performance and longevity.