The guy that is going to build my block said although its not an epidimic "spelling" he has seen a few LBZ blocks with cracks in a cylinder. The cracks were perpindicular to the bore not up and down the length. He claimed to have never seen an LB7 do this. And yes the LBZ block will be for sale that is in my truck, It's going to be a while before its swaped out but I'll send you a PM with details once its out.
Nothing other then the extra webbing changed. The lb7 has the same cylinders as the Lbz so there something else to what he found. How far down the bore did he find this. But send that pm once you get your build going and all.