Frozen water pump bolt

Once in a while, removing the head of the bolt, then removing the timing cover, then grabbing the bolt shank with a small pipe wrench right against the block face and twisting both directions will work. When that fails I remove the bolt shank to flush with the block, center drill as accurate as possible, then step up drill sizes to the size drill required for the thread size ( 3/8 thread requires about 5/16 drill ) and clean up with a tap. I absolutely hate easy outs.