"cylinder head removal kit"

[Colin Ayre]

You need to think carefully what is going on. It sounds likely that there has been corrosion, the volume of the rust will be greater than that of the parent metal so any gaps will have been filled and a large horizontal force will be exerted between the head and the studs.  I was once told with an aluminium head to build a dam around the studs with plasticine, fill the dam with vinegar and then wait.  Keep topping up with vinegar and when it disappears the head will lift off.  Vinegar is equally as good with rust so this may work.  As an alternative, if you have a spare cylinder head, place it on the studs over your present. Head and use as a drilling guide to drill out the studs.  Violence should be very last resort, people have been sacked for using hammers.

Colin