Subject: Re: Rocker pin survival rate!
Thanks very much for this Mike. Yes, the guides have been replaced and also the camshafts are high lift which would compound the sort of problem you describe. I hear no sound of touching when the engine is spun on the starter but of course a hot engine and high revs are a very different scenario. I'll investigate as you suggest.
Different pins failed - first #4 exhaust and then #1 exhaust.