As I stated before I built my 493 in my 63 with their stroker kit and its still running fine. I also have very good service when I called them. But I have only used their stroker kits as I have not used the waterpumps or rockers as they are the two parts I have heard had some problems. But I believe the waterpump is corrected. What I have used of theirs has been very good for me. As for rockers this is the first eng I built of my own that I have used roller rockers on and I have Hughes rockers on my eng now as they are a nice rocker and holding up great. Ron