The last F&%ing manifold bolt!

66plyValiant said

remove the manifold studs on the front and the rear and use the manifold as a wrench to turn the bolt loose (since the bolt usually only seizes to the manifold), if it breaks loose then all you have to do is get it unseized from the manifold or at this point it will turn out easy cut it off and turn it out with vise grips

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Whaaa? Cut it flush after you dick it even more with vice grips or a pipewrench, center punch it and start drilling small to big until you get to threads. Use punch to pry away from threads and drive remains into block if its not a blind hole (end ones are open) chase or tap and put new brass stud in with sealer. Buddy had to EDM one out at aerospace job from a 383 head. That freeze stuff is cool, heard you can freeze the bolt and shatter it with a hammer, never seen it happen but heard it worked. Also an Acetylene torch to heat bolt and a blast of Oxygen at the last minute to blast it out, that was from this board somewhere. Them are some soft studs.