when i was putting the mounts on my engine there was a bolt left in the block. we tryed one of the easy out kits (i think thats it..) but it didnt budge, i think the bolt may have been in there a long time.
i ended up just leaveing that bolt of the mount as i still had three, but i would reccommmend getting the bolts professionally drilled out if you cant get them out too easily.
