Not a question, but a warning. If you decide to replace the rocker housing bolts with new ones, stainless for instance, really make sure you use exactly the same length replacements! Some of the locating threads in the valve housing only have so much thread depth and going over by just a few mm can cause thread stripping. How do I know? Guess!

Helicoils are a wonderful thing. Both threads repaired and engine back together in 3 hours! Oh yes.