Valve seals riding up on valve
We have a set of (BBC aluminum) Dart heads with 15 passes since Dart replaced one head and put new valves and got the other head to new specs. We have a problem with the valve seals riding up on the valves, they are the blue ones with the tiny springs that go around the stem in the seal. Don't know if it is the wrong seal or if the springs are messed up or what. All but about 4 valves have this problem. The heads being new they are not leaking oil but the little springs are getting down in the pan. Before I take them to our head guy, has anyone had this issue? I am calling Dart also, but I am worried something is not right.
Rick