MSD is one of the most recognized industry names in ignition system products, EFI products and high-performance parts. The BLACK ULTIMATE HEI KIT, W/83647, 8225 is their most popular in their line-up product. This is a complete kit to upgrade your HEI to superior MSD performance. This kit is supplied with MSD’s HEAT Digital 8.5 amp performance module, high output HEI coil and extreme energy distributor cap and rotor kit. Its feature is to rebuild your GM HEI with MSD performance, exceptional high-speed coil saturation for full power high rpm operation and it matches coil and module that produces the highest voltage and energy. MSD has produced the best performing and most popular performance ignitions for over 20 years. The high energy spark of the CD design combined with multiple sparks resulted in a potent ignition. Not only did the multiple spark discharge (MSD) ignite the lean fuel mixture, it made overall improvements in the engine's performance! Improved starting, smooth idle, fewer emissions and more power are benefits every car and truck can take advantage of, especially race cars.
MSD, LLC was founded in 1970 as a research and development company by two engineers from White Sands (New Mexico) Missile Range. The men and their other partners were working on a lean burn fuel system called the Electrasonic Fuel Induction system to help fuel economy of new and older automobiles.
As the new fuel system was being perfected, the air/fuel mixture was becoming so lean that it was difficult for conventional breaker points and early electronic ignitions to ignite it. The men of MSD, LLC then started investigating a new ignition system by using a modern technology called capacitive discharge (CD). The CD design opened another door for the ignition, the capability to spark multiple times.