Just in case anyone is wondering why the cams are measured at .040" or .050" lift, there are two main reasons.
One is that it is not as easy to get an exact measurement for the precise timing of seat contact. There have been various selections of specs to measure at, including the traditional .012" lift spec from Enfield, and some other makers use a .004" lift spec.
Second, the .040" or .050" lift spec relates to the opening of the valve, where it unshrouds the seat and flow starts to get flowing better. So, using that sort of spec gives an indication of the period of opening where there is more meaningful flow going on.
However, I find it useful to also know the actual seat timing specs for a few reasons, so I still like to see seat timing specs in addition to any of the other specs provided.