How do you test a HEI ignition coil?

Connect an ohmmeter between the TACH and BAT terminals in the distributor cap. The primary coil resistance should be less than one ohm (zero or nearly zero). To check the coil secondary resistance, connect an ohmmeter between the rotor button and the BAT terminal.

When did the GM HEI ignition distributor come out?

Great Performance, Affordable Cost! GM’s high energy ignition (HEI) distributor has been used as an affordable, easy to install performance distributor since its introduction in the mid 70s. It should come as no surprise being one of the most popular options among modern rodders and race enthusiasts to this day.

Which is the heart of a HEI ignition system?

HEI ignition systems are very dependable and offer great performance on a number of applications. The heart of any ignition system is the coil, battery voltage is supplied on the positive side, while the negative side is repeatedly pulsed to ground.

What are the colors of the HEI distributor?

On a factory HEI, the primary coil leads will either be white and red, or yellow and red. The colors of the leads determine the direction the coil is wound, which determines its polarity. Whenever you are replacing a coil or distributor, it’s always a good idea to be sure to the ground clip is transferred from the old cap to the new.

How does the ignition system work on a Chevy small block?

First just ask yourself where else you can find a distributor and ignition system packaged into one compact, easy-to-use assembly. Installation involves little more than just dropping the unit into the motor and plugging in one wire. It’s hard to imagine anything much simpler, and on that basis, the HEI deserves high marks.

Where is the ignition coil on a HEI distributor?

The HEI distributor actually houses the ignition coil underneath that massive cap. You will need to purchase a new set to match your new distributor. With that said, reattach your individual plug wires to their proper posts. Take your time and make sure you have them right.

When did GM start using the HEI ignition system?

It was not until the model year of 1974 that GM offered the new HEI ignition system as an alternative. One year later in ’75, it became standard equipment for all, and with good reason.

How does a Hei converter work on a Chevy?

It operates in a similar fashion to the conventional points type ignition, but relies solely on a series of electronic signals to turn on and off the primary current rather than the mechanical opening and closing of points. This task is routinely carried out by the switching transistor- located inside the ignition module.

Is the HEI ignition more expensive than a rebuilt special?

Sure, electronic ignitions such as the HEI are a little more expensive than the “rebuilt special” at your local parts store. However, in the long run, the time and headaches you spare fiddling with your ignition will more than make up for the initial deficit of purchasing a new one.