water pipe in back of cylinder head

[rbush]

Hi guys, well I did it, I totally screwed the pooch. I tried to install a new water pipe on the back of my cylinder head and cross threaded the threads on the bottom bolt hole. when I pulled the bolt back out the threads came with it. btw. I replaced the water pipe because the old one cracked right at the threads, the engine got pretty hot, didn't hit the red line but got up there. any ideas on what to do outside of removing head or complete engine? any help would be appreciated as usual.