I had a Clearance Issue, Ended up finding the Cam Journal to be on the high side, Housing bore to be on the high side too, resulting in a stacking of high side tolerances giving #5 a tight fit that didn't feel bad when fitting the cam but odviously a problem. Lesson learned, Measure everything, Don't Rely on Feel and HP Cams Need .002-.003+ Clearance.......

Had the Wider Cam Bearings in the Motor + Roller Cam bearings have issues and a down side too, but you are right they do have a place and an application.