How did the factory attach the housing ends?

On my 8 3/4 the welds are not only visible, but surprisingly sloppy from the factory
These are how the housing ends should look, the chamfered edge would butt up against the housing tube and then be welded on at that point
At the risk of oversimplifying, the rest of the housing is only 1 piece

If your ends are welded on you have a modified housing.