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If you haven't already, start soaking it with Liquid Wrench or another such solvent and gently tap the end of the stud. You can wrap a piece of a rag around the stud to help soak it. Tapping it will create minor vibrations that can help the Liquid Wrench penetrate.
When you get impatient and want to try to turn it with vice grips, wait a bit longer. You can try to apply heat to the block, trying not to also heat the stud. When you try to turn the stud, go counter-clockwise, then clockwise, if it starts to loosen. Instead of vice grips, you may be able to double nut the stud and try to turn the bottom nut.
Worse case scenario is needing to drill it out, using an easy-out and then a tap. In my experience, easy-outs are typically oxy-moronic, i.e. they aren't easy and seldom do they get the object out. Start with a centering punch, small sharp drill bits and work your way up to the appropriate size for the easy-out.
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