only in the last 6-8 months. There aren't a lot of sets of these out because Clark was VERY hesitant on going public with them. I've spent countless hours on the phone with him discussing these camshafts and the others that are soon to come out. Overall though these seem to be doing quite well. The next thing I am going to do is run my coatings on them and do some wear tests and so forth. The dry film lubricant that I use will help with this particular valve train. I'll be coating the lifter buckets and camshafts along with the springs as well.
