These camshafts are regrinds, all web and gude camshafts are regrinds, which typically involves removing some of the lobe at the base of the circle. The other way to modify a stock core is to reweld and grind the cam back down.

In either case I would avoid such a cam for street use, they should really be used most for track cars. It's difficult to gauge wear of the lobes on a regrind for street use over time.