Well today I went and picked up a new head gasket and started to pull everything apart. All the head bolts came loose easily but 1 which broke

there is 1/2in. of it sticking out but I can not get it out, I do not want to ez out it yet because there is enough meat to grab with vicescrips. I have been heating it and using penetrating oil but nothing yet. Any ideas?
On the other hand I found my reason for power loss a burnt and warped exhaust valve that is not seating,and 1/2 of the head gasket was leaking oil/gas mixture. At least the piston and cilinder looked good!
Any help on removing the broken stud would be great it is between the intake and exhaust ports.
THANKS