Finally get the rebuilt head and there's a few surprises. Note that the missing sleeves are not 10 meters long but 10 mm. Also, it's cam end play not lash that I'll need to check.
Thanks for the update! I have the same year 931 (also currently disassembled) and there were 2 guide pins when I removed the head. Split cotter pin with a bevel on each end. These came off with the head when I pulled it. Thought I lost one until I noticed that they get pushed flush into the head if you set it on a flat surface. Take a close look at your head and see if they are pushed in. I was able to push mine back out from the top by hand with a punch. If lost, let me know and I will make some detail measurements of them. Easy to recreate with some thin spring steel. I agree not necessary but will make lining up the head and gasket easier.
