AEM Cam Gear rattling ?

So, I just installed my AEM Cam today on my D16 and I've noticed that when i rev up to 1400 it makes a rattling noise...I did the install myself taking every percaution making sure everything was top dead center and yadaa blah blah...but the rattling noise seems to be coming from the bottom gears. I"ve put the cam gear cover back on and it still is doing it ? Any advice guys ?