What is reason this hole is in the 4.6 block?

While replacing the clutch in my '99 GT, I noticed the hole in the drivers side rear of the block. Can someone tell me why it is there and if there is supposed to be something covering it? You can see the hole in the lower right of the attached picture.

Thanks,

Bill
 

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I was thinking that also, but that is the only thing I would believe fits that hole. The good thing is that as long as the flex plate covers things and you didnt remove anything, then it is one of those don't worry about it Ford items