If I am reading this right he confusion here is a cams only uses the OME valve springs. A cam package uses Cams spring retainers and under the shim buckets. the problem here is waht was Art Meaning when he said cams only? Most people think cams only is a drop in not havingto change the springs retainers and I and bucket shim over set up. Until we get this right this thread might as well be about car tires, Harley Davidisons, or Indians !!!!!!!!!!!!!!