+1 ditch them pipes & get some stainless jobbies, like Ted said do it when the heads warm & plenty of penatrating fluid even days before you attempt to remove them.
Quite often the whole stud will come out with the nut welded on with rust, if that`s the case just buy new studs. Don`t go & re-use them even if you can get the nut off in a vice, just replace with new & smear some copperslip on as well for future.
Ive removed 20 odd in the last couple of years & on half of them the whole stud came out the head (nut seized on the stud) this is why its good to do it with a hot engine (head expands).
Mezo.
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