Please help I’m not sure what engine component this noise is coming from and it’s scaring me. We just swapped the engines. My buddy’s saying spun bearing but during the spark plug unplug test the noise never stops or decreases beside deceleration. Any help would be appreciated.

 

First, WHY did you post this a second time ? Second, why didn't you answer my question to you ?

It doesn't sound like a rod knock, but because the idle speed is so high, you need to fix the idle FIRST and then disgnose the noise.

 

Idle is fixed sir I’m sorry, I adjusted valve lash, I just did spark plug pulling well running test each cylinder and the noise,

https://youtube.com/shorts/Qd_wBnJfv7g?si=auloEU2eq9baleyJ.