Ultra 40 Boot & Terminal Kit - HEI

The Ultra 40 Boot & Terminal Kit - HEI from MOROSO is a complete distributor terminal and coil boot assembly designed for vintage and classic ignition systems using HEI-style distributors. This kit serves as a direct replacement or upgrade for engine builders, restoration specialists, and performance enthusiasts who need reliable spark delivery in high-temperature engine compartments. The 8.65 mm terminal diameter ensures proper fitment across a wide range of classic American V8 and small-block engines, making it an essential component for any ignition system rebuild or restoration project.

The set includes eight individual boot and terminal assemblies, each featuring a 90-degree terminal angle that directs spark plug wires cleanly away from the distributor cap—a critical design element that prevents cross-firing and electrical interference in tight engine compartments. The black insulation material resists ozone, UV exposure, and thermal degradation, maintaining dielectric integrity even under sustained high-temperature operation. The 8.65 mm terminal dimension is precision-engineered to establish firm, low-resistance connections with distributor cap terminals, reducing voltage drop and ensuring consistent spark energy delivery across all eight cylinders throughout the engine's rpm range.

This terminal kit is ideal for restoration work on classic Chevrolet, Pontiac, Oldsmobile, and Buick engines equipped with HEI distributor systems, as well as for custom engine builds requiring OEM-specification or period-correct ignition components. Installation is straightforward—individual terminals simply press into the distributor cap towers, and the boot assembly slides over the cap terminal before connecting the spark plug wire. Technicians and engine builders appreciate MOROSO's attention to dimensional accuracy and insulation quality, which ensures that replacement kits match original performance characteristics without requiring cap modifications or adapter hardware.