Great idea but if it was not on youtube, would not begin to suspect it as being an issue. They got my first cam wrong but that is before I knew to advance or retard using adjustable timing set. One could suspect errors in just about any aspect of this magical piece of hardware. I spent untold hours reading trying to grasp how differences affect performance and driveability. After I failed at that, left it up to the experts which is where I am today. Granted I have forgotten all that I understood which was almost nothing. I do remember the idea of scavenging which made sense.