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.
The initial camshaft choice was very conservative. It was a hydraulic flat-tappet with 214/224-degrees of duration at .050-inch lift, a lobe separation angle of 112-degrees, and .442/.465-inch lift with stock 1.5:1 rockers. This profile is one that should be familiar to old-timers in the hobby, having been a popular grind for decades under numerous private labels.