I have been told several times not to glue the rings in the head, just lay the gasket on the block and then lay the rings inside the gasket, set the head down on top and they will center themselves. I would think the reason for this is that just the thickness of the glue could be a few thousandths and could cause improper seating. Mine are cut in the head and I was running a .020 over 12V gasket, I just had them recut and i am switching to an MLS with firerings. I had trouble with the water jackets sealing up with the 12V gasket. I will let you know how the MLS does, Haisley's said it was the way to go on a CR. Oh ya, my grooves are round cut not square.