I disagree with BryanJ.
To properly torque your head, it should be tightened in stages. First to 7# in full sequence. Then to 12#, and finally to 15#, always performing the full sequence. You can do it in two passes, but 3 is better. THEN, let it sit overnight, and loosen in reverse sequence. Then re-torque in 2 sequences to full torque. This achieves 2 important things: First it stretches the studs by design. Second, it squishes the head gasket fully and provides you the proper length/space to torque the head nuts.
If you simply let it stand, then tighten further, you run the risk of over-torquing the head studs and snapping one of, and achieving an unequal flatness as some studs may stretch more than others. This is a belts and braces approach, but it is the professional method for installation of a head unless you've used torque to yield studs (which ours are not).
I'm not suggesting bryanj's method won't work, but offering different advice I've received from engine builders on all my motors. And using it, I've never had a leak or snapped stud. (Knock wood).