S6 AEC motor run "tack and grind" normal?? vid

Hello Forum municipality I have a question about my AEC.

it's about the general motor run, I'm hanging a video of a 100' S4 I found on the net, my sound sounds pretty much the same.
http://www.youtube.com/watch?v=YqpQmgTCbus&feature=related

it's all about this easy tackering and when you listen very carefully, you hear such grinding sounds from the heads.

I never made a head around it, only sometimes like yesterday again, these sounds become extremely loud, I noticed once after a road fence that after that has hammered like old deutz diesel. has settled down again after a few quiet km.

yesterday I got into the car, started (motor was warm), windows and stopped the engine extremely grinding and tackern, especially from the right head., hood opened, scared :-)
I went on because I had to go home about. 10km.
today he has calmed down again as much as possible and sounds basically like the ABH in the video, just a little louder the grinding.
(for this I had to find out today that the crankwavesimmering has torn me forward and the thing throws again with oil around me *kotz*)

my question is because I don't have a V8 near me that I could listen to, if the sounds are normal and healthy?

had heard in the search of oil pressure holding valves that nimba so hemming, would that be a stop point?

otherwise the motor runs on all pötten, has power and also runs cleanly through

I know nciht obs to do with it, but the cart usually jumps cold very badly and does not take so good gas for a time if you only tap the pedal slightly and has slight oscillators. either I have to orgle for quite a long time, or to orgle for a short time, and the second time he is there immediately on all cylinders.
==References====External links== a minute warm run and then he runs nice again

Thank you for the help and appreciation of the sounds