Just been working on another engine that I pulled out of a running (perfectly well) Volvo 260 and as part of it I always clean and paint the block with glyptal paint. Anyhow I noticed whilst cleaning this one it has a couple of strange welds in two places on the block. This is not a normal place for them to go and having stripped it down there is no damage to the block so I was wondering why thy may be there? If done at the factory why?