Valve marks on head

Posted by Sherlock On 2017/6/7 13:40:14

Good day all. I removed the head on the 740 and noticed some circular marks on the underside corresponding to where the valves rise. Most are quite faint and no indentation could be felt; however, one does have a barely palpable indentation. The valves all look fine and operate as they should. Is it possible that the lifters have been adjusted so the valves are rising too high? Hopefully, the head hasn't been over-planed at some point, although I do have a spare. Any diagnostic advice will be most welcome. The marks can be seen above cylinder 4 in the attached photo.

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