Thanks for all who replied to my earlier post regarding the tapping sound coming from the valves.
http://s1260.photobucket.com/user/37Chev/media/Truck/20160619_090923_zpsctpt52o7.mp4.html

The general consensus was that it was normal
However I can still hear something that to me doesnt sound right

I discovered that if I loosen the valve cover nuts the noise goes away
So it seems that something in the valve train is coming into contact with the valve cover.
Any one ever heard of that before?

I removed the valve cover and looked for any bright spots where contact may have been made but nothing obvious

http://i1260.photobucket.com/albums/ii568/37Chev/Truck/20140823_165148_zpsxob0lsta.jpg

http://i1260.photobucket.com/albums/ii568/37Chev/Truck/2015/20150816_154528-1_zpsqikdrtbx.jpg