Jock itch (tinea cruris) is a fungus, the same one that causes athlete's foot and scalp ringworm. The groin area is the perfect place for the fungi to grow and cause a fungal infection because it is moist, warm and dark.
The camshaft lift is the resultant net rise of the valve from its seat. The farther the valve rises from its seat the more airflow can be provided, which is generally more beneficial. Greater lift has some limitations.
If we were just depending on lobe lift or cam lift, the lobes would be larger than the journal inside the block and then the cam would not be able to get installed inside the engine. This diagram illustrates what lobe lift is and how it relates to the base circle of the camshaft. The next camshaft spec that we are going discuss is duration. Duration is the amount of time measured in crankshaft degrees that the valve is open.