Main Bearing Web Cracks

[garysleeman]

I've got a 660 casting 6.2 block that has about 125k miles on it. I pulled the crank to inspect the block and found what looks like surface cracks in the lower main surface on webs 1 and 5. Doesn't look like they go into the web. No cracks in any bolt holes. Is this a keeper or boat anchor?

[DmaxMaverick]

Tough call, but it's yours. I'd ignore them and move on with a presumed good block, if there's nothing else to be concerned about. It is unlikely the cracks will run into a significant game-stopper, if they do.