http://forums.modulardepot.com/showthread.php?t=55904
Basically here is the problem. Comp puts a ~5* advance into their cams which is why so many people have PTV issues with them. On top of that, the stock stuff can be off by a certain amount. Adding all of that together and get can get some nasty PTV issues. VT does not grind any advance into their cams which is why there are so little PTV issues with them. Normally if people run into issues with them its because they installed them wrong. For example myself. When I installed them I didnt pull off the front cover, I tried using that stupid tool instead. Well without me knowing it the chains jumped how ever many links and I had PTV. Of course I didnt test for PTV before I turned the car on which was stupid on my part. Anyways, I figured out I had PTV by turning it over by hand and I was able to hear the valve hitting. I tore the car apart and retimed it and now I dont believe I have any problems. Im saying "believe" because I have not degreed my cams, nor have I checked the clearences. However, Im not hearing anything when I turn the car over, and my car has been sprayed numerous times on the dyno without any problems. I realize this is not the best way to go about it, but I dont have a choice at this time so please dont get on me about it, just learn from my mistakes. Fidanza and L&Mengines both make adjustable cam gears for our cars.