Ultra 40 Plug Wire Set - Blue

The MOROSO Ultra 40 Plug Wire Set in blue is a spiral core ignition system engineered for small block Chevy engines, featuring 8.65mm diameter wire construction and 90-degree plug boots designed for header clearance. This kit delivers the electrical integrity required for consistent spark delivery while accommodating tight engine bay configurations common in modified and performance applications.

The spiral core design minimizes electromagnetic interference and reduces cross-firing between adjacent cylinders—a critical advantage in high-RPM or turbocharged small block applications. The HEI style terminal connector ensures compatibility with modern ignition systems while maintaining secure contact under vibration and thermal cycling. The 90-degree boot configuration positions wires away from exhaust manifolds and header tubes, preventing insulation degradation and premature failure in tight installations. At 2.45 lbs, the complete kit is lightweight without compromising shielding effectiveness.

This wire set targets engine builders, restoration shops, and enthusiasts upgrading ignition systems on small block Chevy platforms—particularly those running headers or performance modifications where standard 45-degree boots interfere with exhaust routing. The blue identification simplifies cylinder verification during initial setup and maintenance diagnostics. Whether rebuilding a street engine or optimizing a race platform, this kit provides the mechanical compatibility and electrical performance required for reliable spark delivery in demanding conditions.

MOROSO plug wire sets are recognized throughout the performance community for consistent quality control and attention to clearance requirements that generic universal kits often overlook. The Ultra 40 designation reflects the core wire gauge and MOROSO's engineering focus on minimizing capacitive loss while maximizing durability in modified engine environments.