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Ridden salty Winter roads much? Yeesh and I thought mine looked bad. Yours looks like it's been under the sea with Sponge Bob since his original airing. Mine look wonderful compared to that, and yet expect them to break-off.

Yeah machine shops have tricks, ovens and other tools for stuff like this but needless to say that is time and money.

Typically you'd want to expand the hole that the stud is inserted in with heat but it is very hard to heat up the engine head without running the motor. Then you're also heating up the studs, which we want to minimize. Heating up the studs furthers the corrosion they're experiencing, as well as expanding them into an already tight hole.

Try to force some Rust Buster or similar type penetrant / lubricant into the threads after heating it. Let it cool a bit and repeat. Then let it soaking overnight in that stuff. THe idea is to have the stuff drawn in with expansion/contraction cycles. (reality is, not much of that is actually going to happen)

Grab the stud with a pair of parrot-nosed pliers, say a few words to a deity of your choice, attempt to give it a turn and hope the stud don't break-off.
 

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Too much heat in one spot can crack the head.
Cooling too rapidly can crack it as well.
Hardest part about drilling for a tap is not going too deep.
Steel wire tube brushes of excessive diameter are really effective for cleaning up threads.
I avoid using a tap to cleanup threads because it has the potential to needlessly remove thread material.
 

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One of the other fellas will need to chime in.
I've never had to pull the engine so won't be of any help really.
I assume it might be easier to lift the chassis/frame off the engine.
Floor jack with a board on it might support it?
 
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