No way to wait until Sunday - full of curiosity!
Mounted the better rockers back into the engine incl. one spare I got.
Adjusted valve lash and started the engine.
No more noises, but at higher engine temperature noises were starting again fortunately with less "chin chin chin"-noise.
So I took the rockers out at the passengers side. All rockers have a light diagonal movement in the trunnion bearings. One of those in a bad condition.
The two bad rockers were at cyl. 5 exh. and cyl. 1 int.
This would make sense regarding the noise located at front around the distributor area.
I think it will be time to think about what has to be changed and replaced.
I might need some help, as I have to order the right parts because of the high transport and Spanish custom / import taxes. 35-40%! depending on the day, if it is sunny or rainy
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For now I want to thank you all for your kind help and I will be back with this topic lateron...