Originally Posted by
McCloud 85
Don't have a photo of the seal but do have one of the studs I have in my block. These show the flange at the block deck level that can sometimes cause distortion of the face - the cure being the stud should be a continuous diameter it's whole length and a seal sits around the stud sealing the hole into the water jacket.
that block has the same issue as one of mine: the O ring shoulder diameter is such that the counter bore to accommodate it encroached into the oil hole and required an ally plug