it is a cam that has a lobe that opens slower at first then accelerates---so lobe is more pear shaped than egg shaped----really the appearance is that radical, but it was an advanced design that Crower ground for me back in early mid seventies----it was necessary to use a small diameter grinder wheel so was difficult/expensive(not cost effective---required switching wheels, dressing frequently and balancing of the grinder) and never used for shelh/common cam grinds

The numbers I posted are checking numbers but do not really define the cam's charistics

It also stopped some valve bounce on closing but did approach liftr launch at the high opening rate

Jerry