what's this hole for ???

http://members.rogers.com/kunundrum/images/motor/IM001018.JPG

I'm using a B17 block and I'm a little confused as to the nature of the hole that is not covered by the head gaske in the back center of the block.

what is it for ?

that hole is open on my block too, i dont think its anything to worry about.

maybe its for nawzzz yo!!
actually i have no clue

whoa.. I'll try to find out and let you know.

well lets hope its not important, becuase im dropping my motor in tomorrow.