Upgrading Your Chevy Small Block 350’s Ignition System: Points to Hei Conversion for Better Spark

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The Chevy Small Block 350 is a popular engine choice for many car enthusiasts and restorers. One of the most significant upgrades you can make to improve performance and reliability is converting the ignition system from points to HEI (High Energy Ignition). This conversion not only enhances spark quality but also simplifies maintenance.

Understanding the Basics of Ignition Systems

Before diving into the conversion process, it’s essential to understand how ignition systems work. The ignition system is responsible for igniting the air-fuel mixture in the engine’s cylinders. A reliable ignition system ensures your engine runs smoothly and efficiently.

Points Ignition System

The traditional points ignition system uses mechanical points to open and close the electrical circuit, creating a spark. While this system was effective in its time, it has several drawbacks:

  • Frequent maintenance is required to adjust or replace points.
  • Less efficient spark generation, especially at higher RPMs.
  • Inconsistent performance due to wear and tear.

HEI Ignition System

The HEI ignition system was introduced in the 1970s and offers several advantages over points ignition:

  • Higher voltage output for a stronger spark.
  • Reduced maintenance due to a lack of moving parts.
  • Improved fuel efficiency and performance.

Benefits of Converting to HEI

Converting your Chevy Small Block 350’s ignition system to HEI can provide numerous benefits, making it a worthwhile investment for any car enthusiast. Here are some key advantages:

  • Enhanced Spark Quality: HEI systems produce a more powerful spark, leading to better combustion and improved engine performance.
  • Increased Reliability: With fewer components to wear out, HEI systems are more reliable over time.
  • Better Fuel Economy: A more efficient ignition system can help improve your vehicle’s fuel economy.
  • Simplified Installation: HEI distributors are easier to install compared to traditional systems.

Tools and Materials Required for Conversion

Before starting the conversion process, gather the necessary tools and materials:

  • HEI distributor compatible with the Chevy Small Block 350.
  • Ignition coil (if not included with the distributor).
  • Wiring harness for HEI systems.
  • Basic hand tools (screwdrivers, wrenches, etc.).
  • Socket set.
  • Timing light (for timing adjustments).

Step-by-Step Conversion Process

Follow these steps to convert your Chevy Small Block 350’s ignition system from points to HEI:

Step 1: Remove the Old Points Ignition System

Begin by disconnecting the battery to prevent any electrical shorts. Next, remove the old points ignition system components:

  • Disconnect the ignition wires from the coil and distributor.
  • Remove the distributor cap and rotor.
  • Take out the points and condenser.
  • Remove the old distributor from the engine.

Step 2: Install the HEI Distributor

Now it’s time to install the HEI distributor:

  • Position the HEI distributor in the engine, ensuring the rotor aligns with the correct cylinder.
  • Secure the distributor in place with the hold-down clamp.
  • Connect the ignition coil wire to the HEI distributor.
  • Attach the wiring harness according to the manufacturer’s instructions.

Step 3: Connect the Battery and Test the System

Reconnect the battery and turn the ignition on. Check for any loose connections or issues:

  • Ensure all wires are securely connected.
  • Check for any signs of arcing or sparking.
  • Start the engine and listen for smooth operation.

Step 4: Timing Adjustment

Once the engine is running, use a timing light to adjust the ignition timing:

  • Refer to the engine specifications for the correct timing setting.
  • Loosen the distributor hold-down bolt and rotate the distributor to adjust timing.
  • Tighten the bolt once the desired timing is achieved.

Common Issues and Troubleshooting

After completing the conversion, you may encounter some common issues. Here are a few troubleshooting tips:

  • Engine Won’t Start: Check all wiring connections and ensure the distributor is properly seated.
  • Poor Engine Performance: Verify the timing is set correctly and check for vacuum leaks.
  • Intermittent Spark: Inspect the HEI module and coil for faults.

Conclusion

Upgrading your Chevy Small Block 350’s ignition system from points to HEI is a valuable enhancement that can lead to improved performance, reliability, and ease of maintenance. By following the steps outlined in this article, you can successfully complete this conversion and enjoy the benefits of a more efficient ignition system.