The HEI also had a built-in coil, which made installation and wiring a snap. Moreover, the HEI module's expanding dwell function meant that up to about 3,000 rpm, the coil's saturation time was ...

If you have an AMC, a Ford, or a Chrysler distributor with a magnetic pickup, it's really easy to convert to a standard four-pin GM HEI module. We've included a simplified wiring diagram to show ...

Q: Last month we described how to remove a first-generation (’74-’80) High Energy Ignition (HEI) distributor from your Corvette, disassemble it, test its indivi ...

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.