Where does the distributor set when motor is TDC?

The distributor should be set to the position where the rotor points to the terminal corresponding to the cylinder that is at Top Dead Center (TDC) on its compression stroke. This ensures that when the spark plug fires, it ignites the air-fuel mixture at the optimal moment. Typically, this cylinder is the first one in the firing order, but it's essential to verify the specific firing order for the engine in question. Proper alignment is crucial for optimal engine performance.