VZ LS1 Rattle on idle and loudest at 1500-2000rpm with video

[VZ57SSZ]

Hey Guys

My VZ LS1 has developed a rattle on idle and it is loudest around 1500-2000 rpm, here it most on when returning back to idle.

It never used to be this loud and now I am starting to worry.

here is the video LS1 Rattle, any help would be appreciated.

Thanks

 

[uniacidz]

I'm probably wrong, but to me sounds like pulley bearing

 

[VZ57SSZ]

I hope its something simple like that, will release the belt and spin them

 

[VZ57SSZ]

Removed all belts still same noise, its definitely from the front of the engine