Those things have like 150 ft lbs of torque on them; I've always used the hillbilly method of putting a breaker bar on the bolt, and cranking the engine. (taking the usual precautions, of course) Most junkyard cars don't have batteries and rarely seem to have starters. I suppose I could feed a bunch of rope down a cylinder hole and then turn the bolt until the piston binds it up. This is pretty tedious; there's gotta be a better way!
Pigeon