08 engine problems?

Sounds just like mine, maybe a bit louder. I have a 2015 with 25k miles.

 

Sounds like an exhaust leak from the vid, manifold gasket maybe? My 08 had a small leak on mine and I replaced both gaskets and voila

 

Sounds terrible to me. Audio of a sound byte won't be as accurate as in person, but that sounds like engine internals to me.

Piston slap, valve noise, or other. I have a cammed 4.3L, a 4.13L, and a 4.0L. Only time one of those sounded like that was when something wasn't working right. That noise has a very fast repetition. Injectors are loud and make a similar clicking noise. That seems much louder than stock injectors though.

Which weight oil do you use @Lordmasterflex ?

What is the current oil level on the dip stick?

 

Posting these two, for the reference to the frequency of the "tick". First video, is with stock injectors.

https://youtu.be/r1CIKWDo7Qc

Different engine, but made a high frequency valve noise. Until the hydraulic lifters all filled with oil. The injectors are also audible.

https://youtu.be/bls6M98X3RI

Basically, you need to narrow down where the noise is specifically originating.