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 ...

We put a Chevy small-block to the test on the dyno to see if a distributor really can make power in street stock racing classes, as well as if thinner synthetic oil can make more power as well ...

So, if you burn a coil, chip the rotor, or create any other damage, consider rebuilding your own HEI distributor. Mallory's high-power module and coil are also compatible with stock distributors ...

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.