Cracks on C69A block

[30Murray]

I picked up a C69A block and after cleaning noticed some ripple-like lines on one side. Magnafluxing does not show these to be cracks, so I'm wondering if these are just irregularities in the casting. The side of the other bank is smooth. There is a short crack near the water pump mounting, probably from freezing, and I think that will be repairable, but I'm concerned about these other lines.


My question is - are these marks typical of some castings? Perhaps the Canadian foundry had different quality control.