Frozen water pump bolt

Grind the head off and get the cover away from this project...... Go in a different direction from heat. Get some Loc-Tite Freeze and Release. I use it all the time. Read the directions. The other option in regards to freezing is if you have a bottle of NOS at your disposal. Gas that bad boy and put the freeze on it. The shrinks the metal enough to release the rust and bam your problem will be behind you real quick like.... Vice Grips and spin it out....

Good luck,
JW