* Top Dead Center (TDC): Zero degrees on the timing scale
* 5 degrees Before Top Dead Center (BTDC): 5 degrees before the piston reaches the top of its travel in the cylinder
* 10 degrees BTDC: 10 degrees before the piston reaches the top of its travel in the cylinder
* 15 degrees BTDC: 15 degrees before the piston reaches the top of its travel in the cylinder
* 20 degrees BTDC: 20 degrees before the piston reaches the top of its travel in the cylinder
The timing mark is located on the flywheel, and it is aligned with a pointer on the engine block to set the timing. The timing should be set with the engine at operating temperature, and it should be checked periodically to ensure that it is still correct.
Here are the steps for setting the timing on a 1951 Dodge Coronet flathead 6 motor:
1. Disconnect the spark plug wires.
2. Remove the distributor cap.
3. Turn the engine over until the timing mark on the flywheel is aligned with the pointer on the engine block.
4. Install the distributor cap and spark plug wires.
5. Start the engine and check the timing with a timing light. The timing should be set to 5 degrees BTDC.
