Understanding the Change
* Points Distributor: These use mechanical contacts (points) to trigger the ignition spark. They require regular adjustments and can wear out over time.
* Electronic Distributor: These use an electronic module to trigger the spark. They're more reliable, require less maintenance, and often provide a more accurate spark.
Setting the Timing
1. Identify the Distributor: You'll need to ensure you have a compatible electronic distributor for your 1979 Chevy 350. It should be designed for the specific engine model and year.
2. Find the Timing Mark: Locate the timing mark on the harmonic balancer. This mark is usually a notch or line. It will align with the timing pointer on the front of the engine.
3. Set the Base Timing: The base timing for a 1979 Chevy 350 is typically around 6-8 degrees BTDC (Before Top Dead Center). You'll need to consult your engine's repair manual or service literature for the specific timing recommendation for your year and model.
4. Use a Timing Light: Connect the timing light to the number 1 spark plug wire. Start the engine and let it idle. Aim the light at the timing mark on the harmonic balancer.
5. Adjust Timing: Your electronic distributor should have a timing adjuster (usually a bolt or screw). Rotate the adjuster until the timing mark aligns with the timing pointer at the desired base timing setting.
Important Considerations
* Vacuum Advance: Many electronic distributors have a vacuum advance mechanism. This adjusts timing based on engine load, improving efficiency. Make sure the vacuum line is connected correctly and that the advance is working properly.
* Engine Vacuum: When setting the timing, ensure the engine is at a steady idle with normal vacuum. If the vacuum is low or fluctuating, your timing will be inaccurate.
* Ignition System Health: A faulty ignition system (spark plugs, wires, coil) can affect your timing. Ensure everything is in good working order before adjusting the timing.
* Professional Assistance: If you're not comfortable setting the timing yourself, it's best to take your car to a qualified mechanic.
Additional Tips
* Always refer to the repair manual for your specific 1979 Chevy 350 for detailed instructions and the correct timing specifications.
* It's a good idea to double-check the timing after driving the vehicle for a while, as the timing can sometimes shift slightly.
* If you're still having trouble with your timing after converting to electronic ignition, a faulty distributor module could be the culprit.
Let me know if you have any other questions. Good luck with the conversion!
