FR-S engine rebuilt and knocking
 

So I recently had my fa20 engine almost completely rebuilt and close to the end of the break in period I started hearing knocking so I used my mechanics stethoscope and it sounds like its coming from driver side cam box so then I brought it back to the mechanic and he says it's nothing, now I haven't had this car long but I'm sure it didn't sound like this before https://youtu.be/08cpdn1e4QE anyone have any ideas?

Sounds like the high pressure fuel pump or valves. Sounds normal to me.

I don’t hear any knocks , or abnormal sounds .


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