[music man]

They make lube that is supposed to "Creep" down into the threads, but before and after you spray them you might want to take a wrench and GENTLY turn the bolts a hair back and forth, then spray again......repeat, until you are satisfied that the lube has worked its way down into the threads, then try to remove them.

And yes using a torch on a bolt that won't break loose works, but should be used as a last resort, and I would not ever do it to the head of an engine, you could easily warp it. I have used that technique many times on Lawnmower blade bolts that won't come off, but the only problem is that you boil all the grease out of the bearings when you do that, so you can only use it on bearing housings that can be re-greased and even then its not a good idea.

Not only that you could just start your bike and run it for 20 minutes and get them hot.