Top end noise

http://www.jegs.com/i/Mopar-Performance/312/P4452761/10002/-1?parentProductId=746961

That's the cam I have in there.

My mechanic told me to break it in at 3,000 for 20 minutes. I then ran it at 2000 rpm for 10 minutes. ALl the lifters spun.

I guess I just need a reason why this happened for mental stability.