The followers were resurfaced for a new cam that would not have done 10 hours work and did not perform to expectations.
A new cam was fitted and the engine was run for around 20 minutes at 2000rpm followers were not resurfaced for the new cam.
This cam would not have done 500kms and is completely worn out. What is of note is that some of the lifters appear to have been machined much more than others, almost to the point of being concave and the worst of the worn lobes correspond with these ones.
I originally thought that I may have a worn valve spring issue but they appear to be fine, in fact I think they have too much- 110lb seat pressure.
Dave