how to get this barsteward out!!!!

At last I have made space in my cave to get access to start on my Kat, hope to have it built for the ACS do at Squires. Anyway first thing on the motor is to get the front engine mounting bolt out, it's siezed in and snapped, I sprayed it with WD40 several times over the last few weeks, I wanted to put two nuts locked together on the good side however the threads are fubar so I had to use molgrips and heat, no luck so far, any tips? 
