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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