1. Verification:
* Absolutely confirm cylinder #1 is at TDC on the compression stroke. This is crucial. Use a compression tester or a piston stop to be certain. Getting this wrong will result in a non-starting engine or severely damaged engine components. The harmonic balancer markings alone are NOT sufficient.
* Double-check your distributor rotor's orientation. Note where the rotor is pointing before you move anything.
2. Rotating the Distributor:
* Loosen the distributor hold-down clamp. Don't remove it completely yet.
* Carefully rotate the distributor 180 degrees. This will require some force, but don't use excessive force. You should feel it click into place.
* Re-tighten the distributor hold-down clamp.
3. Rechecking and Ignition Timing:
* Re-check the rotor position. It should now be pointing toward the #1 cylinder spark plug wire location.
* Set the initial ignition timing. Use a timing light to adjust the distributor's position to achieve the correct timing as specified in your shop manual (typically around 6-10 degrees BTDC). You might need to slightly loosen the distributor again for fine-tuning the timing.
Important Considerations:
* Shop Manual: A factory service manual for your '79 Corvette L82 is highly recommended. It will provide precise timing specifications and other valuable information for this procedure.
* Spark Plug Wire Order: Ensure your spark plug wires are in the correct firing order. This is also critical and should be verified against your shop manual. A mis-wired distributor, even if timed correctly, won't run.
* Vacuum Advance: After setting the initial timing, check the operation of your vacuum advance.
If after doing this the engine still doesn't start or runs poorly, double-check:
* Spark Plug Wires: Correct firing order is paramount.
* Ignition Coil: Ensure it's functioning correctly.
* Fuel System: Check fuel pressure and delivery.
* Compression: Low compression in one or more cylinders can cause starting and running problems.
If you're uncomfortable performing this yourself, it's best to take your Corvette to a qualified mechanic experienced with classic cars. Incorrectly timed ignition can cause serious engine damage.
