I've just purchased my 98 K2500 with the 6.5 and was doing the HB inspection and would like a second opinion. There is only one very small location that is even remotely questionable, but it appears more of where the ends of the rubber ring meet than a crack, as it is very uniform and directly across. However, knowing how prone these engines are to HB failures I'd like to get more eyes on it. What do y'all think? It's very faint in this pic, but that's also how it looks to the naked eye.

 

That is acceptable there give it a look see every oil change when the go bad they make a awful racket but as long as you fix immediately it will do no damage.