I tore down my LA 360 for a rebuild. when taking off the timing case cover ,I found what looks like a bunch of cracks. they are located right behind the water pump. Where the water pump blades would be.

Not sure if they are casting lines or not. There are allot of them, and there are just as many on the back side of the cover at the same spot.

But both sides are not identical . Have you ever seen this before. I looked at other covers and did not see any of these lines.