Hmm I have to say, honest guy. SO he admitted he jumped the timing on the motor. Well, then it is his responsibility to pull the heads and see. But here is the problem. Now you have a worm. This worm led you to replace VANOS. Mech did it, but jumped timing and the noise is still there. So he could say, the valve was already bent before I messed with the timing, but the way this worm works into your brain, you are going to keep thinking that the mech made it worse.

Best way is to sit down with him and lay it all out. Explain to him that you and him aren't sure what the problem is. But if he indeed screwed the timing and bent the valve, what is he prepared to do?

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2011 E70 50i M Sport