small crack in engine block

[disry240sx]

I am completing the last few things on my sr swap and when I was bolting up my downpipe, I saw this small crack. Has anyone else seen this on their engine? The crack is in an area between two bolts, so I don't think that stress from these being tightened down caused the crack but I am worried none the less. I amhaving trouble getting the picture off of my camera, so i'll post in another post

[quiksilvia]

crack in block = not tight. maybe the pic will somehow prove that its not a prob, but i doubt it