What vehicle/suspension type?

My 06 cummins had rusty hardware up front. With a breaker bar I could get a little bit of turn but not much. The cam bolts had rusted to the steel sleeve of the bushing. I got out the sawzall and cut off my lower control arms, and replaced them with new arms and new hardware. I put anti-seize on the shank of the bolts so they wouldn't rust to the bushing inserts again.

Perhaps you're fighting a similar issue?