The Stovebolt Site Forums The Shop Area Driveline Heating steering parts, how far can you go?

My King Pin is frozen in place and so are all the bolts that hold the brake backing plate to the yoke and I cannot even get the steering linkage connecting arm off the bolts that connect it to the yoke/spindle. How much heat can be applied to the parts to help ease removal? I have a rosebud oxy acetylene tip so I can get it red hot. I ask because of the advisory not to heat steering linkage parts excessively. Truck is a 49 chevy 3100
The steering connector and and spindle/yoke will all need to be heated to get the bolts out of them. Then there is the kingpin.