Hopefully you only stripped a nut or stud, a good excuse to hit the dealership. Should be able to tell by looking at both. Not to worry you, but....
I did a similar thing with a coil stud on the M50. The stud was loose fitting since I bought the car and I finally managed to strip the thread out of the head cover. Cured it by drilling a bit deeper into the head cover and tapped a new bit if thread.
IF (again, hopefully you're not in this boat) you have managed to strip the aluminum threads in the head, you may have luck with JB weld or similar (I didn't). I can't suggest tapping it out larger or deeper as I don't know the dimensions of the M60 heads. Someone else will have a tip if this is the case.
Anyhow, it'll all be OK, repeat, it will all be OK
Dave M