Picture is not that good compare to my normal stuff (cell phone) but still,
you can clearly see that valves position are not equal, some have worn valve
tip, some worn valve seat, some worn valve (circumference, diameter,
angle...)  period.... the rest of the head are in near perfect condition...
So GoWesty, Boston Bob, you are right!!!

http://pages.infinit.net/eurokit/amc1.htm

BUT!!!!! the new head am using have different valves, lately, something as
change.... still.

What to think, am not sure!!! i will do other test tommorow. What am sure of
is the guides and springs are in good condition...
You may think twice about putting VW or stronger valves to replace the AMC
ones. The question am asking myself is that some valve seat are pretty bad!
and on those seat, the valves are ok! For now, am not sure if those valves
in question are straight, that could explain the worned seat!!! Yeap, i
guess that they are to soft....

Cheers, Ben
http://www.benplace.com/

Note: those head were poorly installed (not by me), NO sealant.... use, bad
torque and so on.