The cylinder head replacement is complete as of March 25th 2011. The N52 runs fantastic. Two thumbs up to the mechanics, as it never even looked touched.
I also noted that the engine idles smoother too…
Good luck to all going through the N52 issue.
A quick one page link which I posted before. It is a good read for those just jumping to the end of this thread. It will give you an idea that it is process and does not get fixed in a week.
http://blog.bavauto.com/bmw-e60-e61/...e-tappet-noise
Here is a copy of the invoice if anyone may ever need it.