Hello guys, Recently my S54 started to make ticking noises similar to hydraulic tappets noise on m5x engines when hot. It is not a strong noise, but you can hear it and it wasn't there before. Here is a video: https://youtu.be/3tsy_1On49s Few days ago I checked valve clearance and few shims on exhaust side needs to be changed, but it didn't made that sound before or after checking. I removed the valve cover and all valve shims are still there, all rocker arms in place, there is some wear on cams and rocker arms but there was no significant wear that wasn't there before (I did headgasket 4months back). With screwdriver, I listened to all cylinders and the noise seems to be most audible from the last cylinder. I also tried unplugging coil packs one by one with engine running to identify that it is indeed valvetrain related , and noise didn't disappear. Some pictures with valve cover removed, where some scoring can be seen: What do you guys think?