Steering Arm Hades
Finally, I can offer some assistance to someone instead of the other way around. I just 3 weeks ago put a lift on my 87 K5. When it came time to take the steering arm off, well, to say it didn't want to move is an understatement. I was surprised how many people didn't even know what a steering arm was and kept telling me I was talking about a pitman arm. Anyway, this is what I learned from my experience.
After trying everything and continuing to get bigger hammers, I finally got a sledge hammer and a torch. I would heat the steering arm and beat on it with everything I had. The steering arm will have 3 studs coming through it. After you remove the nuts from those studs, you are SUPPOSED to be able to hit the steering arm and three cone shaped washers will come loose. Mine didn't and I didn't fully understand how the washers worked until I got it out. My cone-shaped washers were completely stuck, so that they appeared to be just regular flat washers which were held in place by rust and age.
After 2 days and close examination, I realized they were actually cone shaped washes which slid over the studs. They were extremely, extremely stuck. I took a ridiculous amount of lubricant and some screw drivers and hammers and finally chiseled them out. They have a very small slit in the top which you can put the driver or pick into and hammer. Get them to turn little by little and if yours are as stuck as mine, they'll eventually come out.
After seeing this, I'm not sure they torch was even necessary. After prying the cones out, the arm itself came off easy as pie.