Fairly certain that in the first picture, just under the second fin, centrally, there's a hole where light is coming through...Unless you see light through it, don't worry about it.
Good idea, to add: drill and tap for the smallest size screw and JB weld the screw in. Grind the back side flush. Then check all of the cam chain guides and make sure the chain is properly adjusted.You could clean it really well in there and apply a layer of JB Weld over the gouges on the inside to seal the hole. Or drill the spot, tap it for 1/8 inch pipe thread and insert a 1/8' inverted pipe plug. If 1/8 pipe is too big you could tap it to 10/32 thread and screw in an allen head set screw, covered with sealant.