torque limit on frozen water pump bolt

someone probly didnt put silacone on the threads and water seeped and froze it in the timing cover,its a pain in the ballz when its in the car....when the oil pans off you can wiggle it loose if its one butt yours is both.....i wood try zap if you can find it.it is a really good penatrating oil.if all else fails you can cut the timing cover where the bolts are then they should turn out.......sounds like fun