I have ran into the same problem with almost the same setup. I'm running vortec heads, 1.5 self aglin roller rockers, and have eaten three cams within 100 miles. The last cam I called Comp directly and gave them every spec on the drivetrain and they ground a cam just for application. That cam only lasted 20 miles. I finally got sick of it at took it to a local machine shop. They are in the process of re-building the long block. This time we are going back Roller. The machine shop and Comp both recommended it wtih the setup I'm running.