I just got a valve job done on my Canadian Mini 1000's head. The machine shop removed these brass tubes from where the smog/air pump air rail connects to the head. These seem to be a Canadian-only part. They are number 12 on the image here: http://www.somerford...age=page&id=116
This is where the air pump rail attaches:
The tubes fit in the holes in the head, and the rail connects over them. There were only three of these tubes. Does anyone know how these work, and do I absolutely need to source the 4th one? I wonder if these are used to cross the coolant passage.