I have searched and tried vice grips, some autozone tool with a sliding hammer, heating them up (only to about 130 degrees), pb blaster, and they havent moved the slighest bit. I have only messed with one cylinder head so far but all of the lifters just came apart showing the internals of the lifter. These things are REALLY stuck, anyone have any advice? I heard of someone using an air compressor to get them out but how would i go about doing that?