Noise coming from engine

BGTS

Member
Hello

I’m having a noise in the engine bay. Could someone tells me what it can be? I’ve been watching videos in search for a similar noise but I didn’t find any. I want to believe it’s not a chain (again) because the two kits were changed around 10000 miles before the noise, when the head gasket had to be changed. Complete original GM kits (unless they were fake). In the beginning, it was not that noticeable but it has been getting louder. It’s that rough, harsh sound. It's just when engine is cold until it warms up. So, a few minutes until it disappears.

https://streamable.com/0mvs22
 
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