hi there i would soak the other studs/nuts in penetrating oil for a few days, when you are ready to have a go at undoing the 3 good ones as seid tap the nuts /studs . then start with a cold engine , start the engine and let it run for 1-2 minites then stop and try to undo the nuts , the alloy head will heat up faster than the studs and with a bit of luck the stud will unwind from the head or the nut will undo as normal . for the snapped stud if possibal weld a nut on let cool down a few seconds then try to undo, if you carnt weld a nut on clamp some molegrips on and heat the head where the stud is then try to unwind . heat is the key here . when you put the new studs in coppergrease them ,i always use stainless steel nuts ,with coppergrease , every few months undo the nuts re coppergrease and nothing will seize . zigzag
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