Black Pro-Billet Chevy Hei Distributor All The Performance And Benefits Of A GM Hei In A Sleek Black Package. Replaces GM Hei Distributors That Use A 4-Pin Module MSD IgnitionThe Chevrolet HEI Distributor is a favorite for muscle cars, street rods and even circle track racers. The integrated coil keeps underhood wiring clean, and for race cars, the idea of running one wire to the distributor keeps things simple. However, when it comes to performance, the stock HEI falls short. MSD answers the need for a strong, accurate and high performance HEI with our Pro Billet HEI. The distributor is supplied with our Digital HEI