Hei Module Symptoms: Rough Idle, Pinging, Poor Performance, Stalling When one part of the HEI module fails, the engine has no spark and does not run.

The Super HEI Kit-which is a smog-legal modification, by the way-allows you to retain an already installed HEI distributor. Depending on the type of module you're running (four-, five-, or seven ...

Think that a GM-Style HEI-Based Ignition Mopar is blasphemous? Thanks to Steve Davis and his company Performance Distributors, we show you why its not!

Originally, the HEI system was fitted with a four-pin module. By 1978, it had a five-pin unit. Seven and eight-pin modules were more a computer-controlled element that came around in the 1980s.