If the broken spark plug was caused by overtorqueing(i.e. too much tightening), an Easy Out tool (special tool) may not be of help but is worth a try. Really depends on how much or how little of the thread remains embedded. Having somebody pulling/ holding the head cover while you work on hack sawing (carefully)the broken plug might work. This will only entail cylinder head gasket replacement which is far better than a top overhaul, unless your car is due for PMS anyway. Drilling the broken plug bit by bit is pretty laborious (not to mention dangerous) and may allow bits of metal to enter the cylinder. Take your time then decide.
while we're at it, i suggest using an anti seize when installing new spark plugs on a cold engine!





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