Yes, in my aluminum race engine. It is unlikely that you would gain any benefit from roller cam bearings on the street. They will however, lower the
oil demand in a race engine that turns 8-9000 rpm by 3gal./min since they don't require direct oiling. They also have a larger cam journal diameter and that will allows the base circle to be larger on those .700-.800 lift cams. As mentioned friction reduction is another gain.
Scott