re: CB750 cylinder head removal:
This is prompted by a problem posted in another thread. There are 16 head nuts and 4 screws. The screws go down the center from side to side, residing under the 1,3,4, and 6th rubber puck. When disassembling these should be removed first. A slight tap with an impact should do it. Often not even that, a T handle #3 phillips is good.
If you remove the head nuts first, all of the relief pressure of the head will be released into those 4 screws and they ain't never coming out. Which is the purpose of this post. Don't get in a position where you've stripped the tops off these screws, trying to get them out with the head nuts off.
On reassembly, put the 4 screws in first and snug them down in alternation. This draws the head into its ORings, dowel pins etc, letting you know everything is OK. Then put the nuts on per manual, alternating and sequencing. Having done that the screws will now be loose again, so you'll need to snug them down some more to keep them from rattling around and maybe backing out. I've often threatened to just take them out and leave them out. But the holes may fill up with crud so I leave them in.