There I was faced with a flange gasket leak on my 235 and the thoughts of a broken stud because the nuts haven't been removed for over 30 years. Over the course of the last 2 months I've soaked the nuts with PB blaster and finally got the nerve to put a socket to it. I didn't want to get carried away so I used a 3/8 ratchet.The rear nut came off no problem, but the front was locked-up. Ok heat, PB, socket, no go. Heat, wax, cool down, socket, no go. Three days of this sequence/combination I heated that nut red put an ice cube on the stud and YES that nut submitted. Today was a good day and the moral of this story is patience is a virtue and every problem has a solution.