Though many people will suggest the soak and brute for method for removing seat posts or steering stems, you do so a great risk to the frame or fork set. I have destroyed a lovely old Torpado frame set once just because I used the above method. Now days, when I encounter a badly stuck stem or post, I cut them out and ensure that no damage will be transmitted to the frame.

This is how I do it...

http://www.mytenspeeds.com/My_TenSpe...troduction.htm

Hope this is a help.