Valves don't get loose... and you can't tighten them.... Depends on the video it could be just exhaggerating the valve tap, but sounds a bit loud to me... Just see if you are getting enough lubrication.
Well also you have it in an enclosed area so noises are going to sound different.. Take it outside AFTER you see if there is any exhaust leak near the turbo area and then take another video...
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