Are these the bleeder taps you're working on? I'm going to guess, since this is on a radiator, that you've got some combination of corrosion and possibly some old pipe dope holding things up on the threads themselves, and the very real possibility of an accretion of scale on the inside that might be acting as a flange to keep you from getting it started.
If there's no other reason not to, I'd put the heat to them to try to break up any chemical adhesion, just like you would a stuck bolt on a tractor. I don't know if brass expands more than the iron or steel with heat, so I don't know whether to recommend trying to remove it while hot or to let it cool. With steel bolts in iron or steel, I've had better success heating bolt heads until they just start to come red, maybe even a little yellow at the edges and then letting the whole thing cool -- the expansion and subsequent shrinking will often break up any rust bonding the threads and they'll come right out, even if they take a wrench the whole way. I'd suggest at least one cycle like that.
If you can prop the radiators so that the threaded hole is vertical, it can also help to squirt a little of your favorite penetrant (after everything has cooled from red but is still hotter than you'd want to touch, so that it can be drawn down into the threads as it cools.
On the chance that the brass expands less than the iron/steel, go one cycle as I've described and there's no improvement, try a second heating, focusing the heat more on the surrounding metal than on the brass. O/A is good for this approach as you need to heat it quickly before too much of the heat transfers to the piece you're trying to get out. If you're a householder, I've found a regular propane torch is usually too cool for this approach, but that Mapp gas (in the yellow bottle) usually works pretty well.
Keep in mind that you're likely dealing with a tapered pipe thread, so somebody my have put the gorilla wrench to it in the first place. If so, good chance it'll come pretty easily if you can just get it to pop.
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