When did Chevy start using HEI distributors?

When did Chevy start using HEI distributors?
Chevrolet started using HEI (High Energy Ignition) distributors in 1974. The HEI distributor replaced the previously used contact points and condenser system with a control module and a magnetic pickup inside the housing. Initially, early HEI distributors had reliability issues in high-performance applications, particularly at engine speeds above 5,000 rpm. However, General Motors quickly made modifications to the modules and coils to offer increased spark energy at higher engine speeds, making them more reliable. The HEI distributor became a popular and reliable ignition system, known for its ease of use and performance.

What is a Chevy HEI distributor?

The HEI distributor is an inductive-discharge-style ignition, but with the points replaced by a solid-state switching device called an electronic ignition-control module.

How do I know if I have a HEI distributor?

The easist way is just look at it,the HEI distributor cap is taller allowing for the built in coil in the cap. The non HEI cap is much shorter & the coil is external.

What year did GM change the ignition switch but not change the part number?

2006
Regulators, watchdogs and plaintiff attorneys have seized on the fact that GM did not issue a new part number when it altered the ignition switch in 2006 as an indication that someone may have been trying to fix and hide the problem at the same time.

When did Chevy switch to HEI distributor?

High energy ignition, also known as H.E.I., is an electronic ignition system designed by the Delco-Remy Division of General Motors. It was used on all GM vehicles, at least in the North American market, from 1975 through the mid-1980s.

What is the difference between an HEI distributor and a regular distributor?

The HEI system produces a more powerful spark, which allows for a wider spark plug gap. This delivers better ignition of the fuel/air mixture.

What year did GM start using electronic ignition?

1975
Chrysler made electronic ignition standard in 1973; GM, Ford and AMC followed in 1975. But, alas, for us this is nothing more than a red herring, because electronic ignitions aren’t necessarily computerized — they simply replace a few moving parts with more reliable and less maintenance-intensive components.

When did GM stop using distributors?

It depends on a specific company and sometimes a specific line of cars. Many GM vehicles had theirs phased out around 2005 or so.

How can I tell what type of distributor I have?

If you can get to, or remove your distributor, you should be able to see product numbers or visible markings on the outer casing. Failing that, a distributor can often be identified visually, so sending us details of the car and photos of the distributor should allow us to identify the exact model you need.

What goes bad in a HEI distributor?

A common HEI malady is for stray voltage to burn through the rotor and to ground through the small mechanical advance weight pivots. The evidence is a rusty-looking iron oxide film on the inside of the rotor and distributor cap. This is clear indication that the posts will be badly worn.

When did distributors stop being used?

The 1990’s was the time when distributor ignition systems were phased out. “coil pack” style ignitions were used prior to 1990 but in limited application.