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 ...

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're swapping points to an HEI distributor to lower maintenance requirements, you're good to go, but will you be able to feel a difference if you do?

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.

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 ...