HEI Distributor & MSD 5520 Street Fire Ignition Box Kit for Small Block Chevy (SBC) and Big Block Chevy (BBC) Engines - Compatible with 350 Models - High Performance Upgrade for Street Racing and Hot Rods

Complete assembled HEI distributor ready to install. High output 50,000 volt ignition coil pre-installed. Premium high-temperature distributor cap with brass terminals. 4340 chromoly steel distributor gear compatible with cast and steel billet camshafts. Mechanical and vacuum advance systems, vacuum adjustable right on distributor. GM standard 4-pin electronic ignition module included rated to 7,500 rpm. Performance advance curve built in. MSD Street Fire ignition control unit for high output spark energy included. Distributor cap outside diameter of 6-inches clears most firewalls. Service parts easily available for maintenance and repair needs. Includes distributor base gasket. Includes HEI distributor wiring connector pigtail for easy installation. Pre-assembled red HEI Distributor “under header” ignition wire set included. Our HEI Distributor for Your Small Block or Big Block Fits Chevy is a Real Performance Value General Motors’ High Energy Ignition (HEI) debuted in the 1970s to replace the long used points ignition system that had been in place. HEI systems provide a more powerful spark to the spark plugs, allowing a wider plug gap for more complete ignition of the air/fuel mixture that has been compressed in the combustion chamber. The system is remarkably simple and dependable, with a direct mounted ignition coil and only requiring a single key switched power connection to function (with a properly grounded engine block of course). This eliminates the external coil, coil mounting bracket (and the room for it), any resistor wire or ballast resistor, and the wiring between the coil and distributor. Due to the popularity of the GM HEI distributor, there have been numerous versions sold online over the years, many of questionable quality. Often, there is no way to easily source their GM HEI distributor parts to keep that bargain Fits Chevy HEI distributor you scored online somewhere in running condition