
HEI Distributor For Small Block & Big Block Chevy
JEGS 555-40002 HEI Distributor Features:
- Complete HEI Distributor replaces Small Block Chevy 262, 265, 283, 305, 327, 350, and 400, as well as 396, 427, and 454 big block Chevy-based engines
- High voltage 65,000-volt coil provides a hot spark for maximum performance using solid brass terminals
- Easy drop-in installation using the 1-wire hook-up
- High-quality CNC aluminum body provides years of trouble-free operation
- Fully compatible with flat tappet and hydraulic roller cams
- Adjustable vacuum advance
- Coated weights for corrosion resistance
- Welded weight pins for durability
- Standard-type steel distributor gear for hydraulic or solid flat tappet cams
JEGS 555-40002 HEI Distributor Notes:
- Utilizes an O.E. 0.491 in. diameter distributor shaft and will require a different drive gear for a solid roller camshaft
- When installing in a non-HEI vehicle, Power & Tach Feed Wires 555-10552 are recommended and sold separately
- To protect ignition system components, always disconnect all vehicle power sources before performing welding on applications equipped with an HEI distributor. Electrical surges from welding can damage sensitive ignition electronics.
Emissions Note:
This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.
CLICK THIS LINK FOR IMPORTANT CARB & EPA EMISSIONS INFORMATION ABOUT THIS PART
Distributors with Power, Reliability, and Simplicity
The GM HEI (High Energy Ignition) distributor is a self-contained, high-performance ignition system developed by General Motors in the mid-1970s. Known for its reliability, high voltage output, and simplified design, the HEI integrates the ignition coil directly into the distributor cap, reducing wiring complexity and eliminating the need for an external coil. It replaces mechanical points with an electronic control module, delivering a stronger and more consistent spark across the RPM range.
The JEGS High-Performance HEI Street Spark Distributors are a popular upgrade for classic muscle cars, hot rods, & classic trucks, Buick, Chevy, Olds, Pontiac, and are available for multiple GM Engines.
Click your favorite brand to view JEGS High-Performance HEI Street Spark Distributors for other engine manufacturers, AMC, Ford, Jeep, or Mopar Engines
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The JEGS High-Performance HEI Street Spark Distributors for GM Engines are engineered to deliver reliable ignition performance, improved throttle response, and consistent spark energy for street-driven and performance-oriented builds. Designed specifically for GM applications, these HEI distributors provide a powerful, self-contained ignition solution that simplifies installation while enhancing combustion efficiency. For enthusiasts upgrading an older ignition system or refreshing a classic build, a high-performance HEI distributor is a proven way to maximize engine reliability and drivability.
High Energy Ignition (HEI) systems are known for their strong spark output and straightforward wiring, making them a popular upgrade for small block Chevy and big block Chevy engines. With durable construction and performance-calibrated advance curves, these distributors help optimize ignition timing for improved engine response and smoother operation.
Performance Benefits & Key Features
JEGS High-Performance HEI Street Spark Distributors for GM Engines are designed to provide consistent spark delivery across the RPM range. A powerful internal ignition module and high-output coil help ensure reliable combustion, especially in engines equipped with upgraded camshafts, higher compression ratios, or enhanced airflow components.
Performance enthusiasts often prioritize features such as adjustable mechanical advance, durable housing materials, precision-machined shafts, and compatibility with performance spark plug wires. These attributes contribute to stable timing control and reduced misfires under load. The result is improved throttle response, smoother idle quality, and enhanced overall engine performance.
These distributors are ideal for street performance builds, restoration projects, weekend cruisers, and light drag racing applications. Whether you’re running a carbureted setup or a classic intake configuration, upgrading to a high-performance HEI distributor ensures dependable spark energy without the complexity of external ignition boxes.
Fitment, Compatibility & Applications
The JEGS HEI Street Spark Distributors are engineered for GM engine compatibility, including popular small block Chevy (SBC) and big block Chevy (BBC) platforms. They are commonly installed in classic GM vehicles such as Camaro, Chevelle, Nova, El Camino, and C10 trucks, as well as street rods and custom builds configured for Chevrolet V8 engines.
Thanks to their integrated coil design and straightforward wiring, installation is typically simple for vehicles originally equipped with GM-style distributors. This makes them a practical ignition upgrade for daily drivers, restomods, and performance street cars alike.
If you’re looking to improve ignition performance and reliability in your GM-powered build, explore the JEGS High-Performance HEI Street Spark Distributors for GM Engines and choose a dependable spark solution built for enthusiasts who demand consistent results.

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