oil pan

Now lets just think about this and give me some good answers. When the pan is on and all the specified amount of oil is in the motor on any motor whether it be a slant six or a 440 or a 426 hemi. What would be the oil level in the pan in comparison to the bottom of the lobes on the crank. The crank doesn't run in the oil so how far below the crank is the oil level not running. Does it vary from one motor to the next? I guess one could fill a stock motor with oil and drop the pan and see how far down in the pan the oil level is and then see how far the crank lobes set below where the pan flange bolts up to. Anyone ever heard of a crank scaper?