AND to further amplify the pucker factor: Rick told me that the "older version of the 50 DN were worse than the newer models". I didn't dig into that comment because he looks at the 50 as an end item and doesn't associate it with an engine or bus model. The Knuts here could probably expand on that topic with much more useful info. To me that meant that the 4104 and 4106 guys had more to be concerned about, but, as was stated, that may not be much.
I did pick up an interesting tid bit though, Rick scoffed at the idea of having the 50 oriented properly for the oil cooled version. He said that that didn't matter and that it would cool ok regardless. I have read posts where the owner was cautioned to remove his 50 and put it back with the
pointed "up"....flat spot? Considering that you need a crae to lift the thing in and out, not having to do that is some sort of really good news.