Thanks mate that's interesting to know one other thing I was wondering might be a daft question but I'll ask anyway do the headbolts have any stretch issues an does anyone have a measurement to check to them
Managed to get two better mobile pics looks like someone's got a bit giddy with a dremel or they smashed both the exhaust valves at some point maybe but thats only a guess. Looking at the ports it looks like they have got really giddy with some idea in there head haha! Pun intended. I was a bit concerned about the scoring on the seats Eddie but I am still learning about these things.
What do the inlet ports look like? Have they been opened up?
I think they should be 28mm on an early head
If it were mine I would fit new valve guides and valves and cut the seats and give it a go
It doesn't look like it's been skimmed to get the compression higher or anything like that
Can you post some more photos up?
If you decide to do the valve guides yourself take lots of advice first , there's lots of pitfalls with replacing valve guides on commandos
Keep us informed what you plan to do
Had a few quotes on putting the guides in new seats so gonna explore getting a better 68 head first as there's other bits id like to fix on it as well so looks like it could be more cost effective to get a replacment. Missed out on a nos one for 300 quid the other week sods law always when you arnt looking lol.