I have one pipe steam radiators. I recently removed one of them to install laminate flooring which raised the level of my kitchen floor slightly. My radiator of course does not now line up with the steam pipe. I thought I could just unscrew the top of the incoming pipe a turn or two to get them to match up, but it does not budge. Is this feasible? I can put more force and use a longer lever but I don't want to break the pipe.

The alternative would be to cut holes for the radiator legs, but that would defeat the purpose of putting in a nice new floor.