Hi as others have said heat, but if it was me I would heat them cherry red, then cool them slowly with cold water. Then try un doing them, going from side to side gently with the wrench to clear threads as they hopefully move . Never try moving them hot you will probably strip the threads off the stud/nut. The water will break the rust loose on cooling, lay off the impact also as you can't feel whats happening to the threads.
Looks to me like they are studs threaded in the manifold. if you break them off ,they may of heat hardened over years of use, cast manifolds can get hard to with the heat from the motor over time. Have had some here a good file won't touch . This might make getting them out or drilling and re threading pretty hard. Go careful with them, slow pace now is better than a huge headache later. Regards Robert
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Today's Featured Article - Bad Vibes - by Curtis Von Fange. One of the strangest ways to communicate with our tractor is to ask it how it feels. "Ask it how it feels," you say? Yup, ask it how it feels. Now, as with the other articles in this series one has to be able to hear what 'ole blue' is trying to say in response. The nice thing about our old iron friends is that they are usually quite consistent in their response, rather unlike some people I know who might change what they say due to the weather or other mitigating circumstances. But since t
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