I need help. In process of removing intake manifold to replace gaskets and silicone seals for that C4 rear oil leak thingy. Everything I've read says it is an easy job. Yes, it was kind of easy but I'm screwed up and not even half way there. Encountered first problem, when I tried to uncouple the Secondary Air Injection Pipe nut from the pass. side exhaust manifold. Little room to work. I managed to get a 13/16" crows-foot on the thing, but for the life of me I can not get it to budge. About all I can get on it is that 3/8" drive crows foot and a 3/8"-to-1/2" drive adapter coupled to a 1/2" drive x 15" breaker bar.....and that baby won't budge. Starting to round off the nut a little. I've soaked the threads overnite in WD-40, but that does not help either. How can I get that thing off without destroying the whole piece, nut, tube and all? That unit looks expensive! My mechanic bro says I'll need plenty of heat, but I'm not sure if I can get a real good fit with that crows foot any more. Also, that bolt is very close to the dipstick tube, valve cover, plug wires, etc. Burn baby burn! Help. Is there some kind of special adapter for that thing? Any other suggestions? I'll try to attach a picture of the piece for you.