FWIW, build you wood box big enough for the heads. Seal it good with silicone caulk. Put the head in. Pour enough white vinegar init to completely cover the head. In 24-48 hours, take it out and use a light plastic brush and a hose and brush and rinse the rust RIGHT off.
Haha, you bet. They are a wee bit rusty. All the thread holes should be chased as well. I guess I'll be making my local machine shop happy. Lots of work need on this old beast
