Strange clanking noise. Anyone have any thoughts on what it could be?

[GMans 5.0]

Wife sent me a video of my truck making a weird noise after she had started it up. Noise did subside after a few minutes. Anyone know what could possibly be the issue? Thanks.
21 5.0 Lariat 4x4 68k miles

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[jkosh22]

That sounds to low pitch to be a heat shield. First step, check the oil. It sounds like valve train almost. Although speakers do distort sounds so it could sound different than what we are hearing. Check what you can check, oil, belts. Crawl under and hit exhaust (when cold) and see if you can re create the rattle.

 

[thiggins]

I'm going with a bad belt pulley.
Use a long screwdriver between the pulley and your ear to find it . They're not expensive.

 

[GMans 5.0]

That sounds to low pitch to be a heat shield. First step, check the oil. It sounds like valve train almost. Although speakers do distort sounds so it could sound different than what we are hearing. Check what you can check, oil, belts. Crawl under and hit exhaust (when cold) and see if you can re create the rattle.

Appreciate the response if I find anything I will post again with an update.

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