However, you cannot determine the correct wire placement from just the firing order alone. You need to know which cylinder is number 1 (and the rest will follow sequentially). This is typically determined by physical location on the engine, and may vary slightly depending on the specific engine's orientation within the vehicle.
To correctly connect the wires:
1. Identify Cylinder #1: Consult a shop manual or a detailed diagram for your specific 1972 Chevelle 350 engine. This is crucial. The location of #1 varies slightly based on intake manifold and other components.
2. Follow the Firing Order: Once you know #1, use the 1-5-3-6-2-4 firing order sequentially. For instance, if you found #1 cylinder, then the next spark plug wire would go to cylinder #5, then #3, and so on.
3. Distributor Cap Orientation: The rotor in the distributor will rotate, and the firing order is related to the position of the rotor. The number 1 wire typically connects to the terminal directly in front of the rotor when it is pointing at the #1 cylinder post.
Important Considerations:
* Shop Manual: A factory service manual for your specific year and engine is your best resource. It will have diagrams and clear instructions.
* Professional Help: If you're not comfortable working on your engine, it's best to take it to a qualified mechanic. Incorrect wiring can damage your engine.
Don't attempt this without a proper understanding of your engine's layout and the risks involved. A wrong connection could lead to a no-start condition or engine damage.
