Hi, I just bought a S5 NA block and noticed a small crack in the blind hole just above the trailing plug on the rear rotor housing and was wondering about the severity of it, would this make the housing useless or is it just not even worth worrying about?
sorry about the picture quality, I couldn't get the camera to focus.

 

It's hard to say without a better picture, but it appears to be a superficial crack from the casting process. It would have to go all the way down to the water jacket to affect anything.

 

quite possible it looks like a crack but probably nothing major.

 

i have the same thing in mine right at the knock sensor. should be fine unless it goes all the way through, wich it probably doesnt.