The HEI (High Energy Ignition) distributor is a popular aftermarket choice for many vehicles, especially Chevy 350s. The HEI distributor is a self-contained ignition system with an internal coil and module that eliminates the need for external spark plug wires. It is both reliable and powerful and can provide a smoother idle and better fuel economy than older points-style systems.
The main components of an HEI distributor are the distributor cap, rotor, and ignition module. The distributor cap houses the terminals to which the spark plug wires connect. Inside the cap is a rotor that turns around and distributes the high voltage generated by the ignition coil to each spark plug in the firing order. The ignition module monitors engine speed, spark timing, and other parameters to adjust the spark advance accordingly.
When it comes to wiring an HEI distributor in a Chevy 350, it is important to pay attention to the correct firing order, as well as the polarity of the connections. Depending on the model, the HEI distributor may be wired directly to the battery or via a ballast resistor. It should also be wired to the starter solenoid, distributor vacuum control, and tachometer, if applicable.
Advantages of Using an HEI Distributor
Using an HEI distributor has many advantages over older points-style systems. It is easier to install and more reliable since there are fewer moving parts. Plus, it offers a better spark and improved engine performance due to its high-energy coil. The spark is also more consistent due to the control module, allowing for smoother idling and better fuel economy.
An HEI distributor can also be used with a coil pack ignition system, which eliminates the need for spark plug wires completely. This can make installation simpler and provide an even more powerful spark than the standard HEI setup. However, it is important to check the vehicle’s compatibility with this system before attempting to install it.
Firing Order and Spark Plug Gap
Understanding the correct firing order for a Chevy 350 with an HEI distributor is essential for proper engine performance. The firing order is 1-8-4-3-6-5-7-2, with the number one cylinder being the frontmost passenger side cylinder. When installing the spark plugs, the recommended gap for most vehicles is .035 inches, although some engines may require a different gap.
Common Issues with HEI Distributors
Like any mechanical system, HEI distributors can encounter problems from time to time. Common issues include faulty spark plugs, distributor cap corrosion, and carbon tracking on the distributor cap. Additionally, the ignition module may fail due to overheating or age, in which case it will need to be replaced. Fortunately, most of these issues can be easily fixed with a few common tools and some basic knowledge.
In conclusion, the HEI distributor is a reliable and powerful aftermarket choice for many vehicles, especially Chevy 350s. It is easier to install than older points-style systems and offers a better spark and improved engine performance. It is important to pay attention to the firing order and spark plug gap when installing, and understanding common issues can help ensure the system runs smoothly. With proper maintenance and care, an HEI distributor can provide years of trouble-free service.
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