I did not mean to hijack the thread, but I feel it has been a great discussion about rebuilding and has also offered the OP some suggestions to get great professional engine jobs.
In the spirit of keeping this discussion alive and further the education and to help me, I have a question.
What year did they incorporate an oil passage in the case above the drive side race into the race? Secondly, is this a worthy addition to an older model engine?
If this is a worthy upgrade - what size hole is it and approximate location? I would think it would enter the bore for the race where the recess is on the race - thus providing a passage for oil. I just don't know how far above the race ID it should be and how big. I can also see the need to avoid exposing this hole to the outside of the case.
It makes no sense to me to have a hole in the race to just collect crap without a way to feed it or to flush it. I can see things like honing grit and other stuff just collecting in there. There is evidence of grime in there when I removed my current race.
What are the thoughts on this?