I struggled for about 45 minutes trying to get the head to release, rechecked my procedure and nut count
I found my docs did not have reference to theRN MANIFOLD TO block stud mount, shown in the picture, parts (7-13)
You get head separation of about 5 mm if you forget to remove this then it sticks
Parts explosion and numbers
On edit,,,my car had a stud and a nut, not a long bolt like part (7) shown here, clear in my picture






