Hi I have a noise coming from my engine which is making me paranoid! The engine has done less than 10k after full rebuild inc new pistons and cams. The lifters were not replaced so could this noise be a lifter?

First video is from cold, been started roughly 30sec

http://s108.photobucket.com/albums/n...t=37562102.mp4

Second video is up to normal running temperature

http://s108.photobucket.com/albums/n...t=45fd07bc.mp4

Oil pressure was 52psi at 2500rpm

Any help is much appreciated
Thanks Billy