Right I have recently purchased an old triarm 400 rr an it has a broken cam shaft no biggy... However I decided to take head of to cheak seals an valves etc... The cylinder head will not let go any tips or tricks would be appreciated. I cheaked manual an have everything out that needs be. But just not releasing

 

Welcome to the forum Dannie. I'm not familiar with a 400rr but when I pulled the head of a '79 CB750 I had, I found out that there were two10mm bolts holding it from the underside,1 on each side. If you look at the end of the head from the ground up you may see a small hole in the bottom fins where you need to go up in and pull the bolts.
If thats's the case let us know.