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Wow, that's freaky, well as long as they turn it could promote even valve seat wear.
Frequently cams are cut to actually induce the rotation in the valves... In this case with the finger follower, it's just a result of the spring compressing/decompressing. So... engineering sorts... WTF is there a finger-follower on a high performance/high RPM engine? Is it a BMW thing?
As I suspected, that was about 12k faster than the video could resolve. Neat-0