Thanks for the supportive words. Yes Kev I'd only gone to about 70% throttle at moderate aggression and 6000rpm max so far.
Pulled the cams and head today. Cams all in good nick, tensioning guide showing a groove from the chain will need a new one next year maybe.
Good news is the pistons are all perfect from what I can see. Valves and combustion chamber too.
So I haven't been getting knock unknowingly.
Chain same length as last inspection.
The titanium retainers weren't bad, they hadn't worn any more since last inspection a few thousand miles ago.
Except one, was close to a breach!
Caught in time.
Old example on left, new one on right.
I hate this job, the collets are a pain in the neck.