@Miller605, Ok so the truck has 150k and the head work was done at 145k by previous owner. Just to clarify, you said the sound started after the head work was done so you bought the truck and drove for 5k miles in the last year while this noise was present.
What is prompting you to now decide something is wrong? I am not trying to be confrontational but your previous posts are not clear to me. Also, thank you for the video but without being there I am not sure anyone can determine what is wrong. Also note that responses will be educated guesses from peoples past experiences.
Does the noise only occur on the first initial cold start or will it do it every time you start?