I believe that is a older crane grind hence the cra at the beginning of the part number. I know It isn't an ultradyne,for one the lash is usually a bit tighter and crane seemed to like the 106 on the race stuff.
The CRA in the beginning of the part number, C stands for conventional nose, D would stand for Dwell nose, as used in stock eliminator racing.
R stands for lobes suited for higher rpm design.
A stands for asymmetrical cam, opening and closing ramps different, which usually have a slower closing rate to eliminate valve bounce.
