Replacing the 121 head that had cracked on my '74 2002. Got a replacement head from a fellow forum member, and had everything redone at a local machine shop. Now I'm starting to reassemble things, and I see that I need to change the heater connection port on the back of the head to the later, larger diameter fitting.
A 22 mm box wrench, a hammer, and some swearing have failed to break it free so far. Anyone have any tips on this, or should I look into swapping hoses instead of fittings? I have considered breaking out my impact wrench, but I'm not sure if that's taking a risk. Do not want to damage my "new" head at this point - too far into it to start over.