Here's why:
* Number 1 Cylinder Location Varies: The location of cylinder #1 differs between engine types. You need to know the specific engine model in your 1978 Buick Regal Turbo.
* Different Engines: The 1978 Buick Regal Turbo could have come with either a 3.8L V6 (also known as the "3800" engine) or a 5.7L V8. The number 1 cylinder location is different between these two engines.
* Firing Order Matters: Even if you know the engine type, you need to know the engine's firing order to determine the location of cylinder #1.
To figure out the location of cylinder #1, you will need to:
1. Identify the Engine: Check your car's documentation or the engine itself for the engine code or model.
2. Find the Firing Order: Search online for the firing order for your specific engine (e.g., "1978 Buick Regal Turbo 3.8L V6 firing order").
Once you have the firing order, you can locate cylinder #1.