As many of you know BMW is famous for their inline 6's that sit in the engine bay at a slant like this m50. I am struggling to find out more information on the angle of these motors specifically the m20 and m30. From what I have found so far the word seems to be that the m20 sits at around a 30°-33° angle off vertical. Unfortunately I have not found any source that seems credible and I've found nothing on the m30.

Does anyone have any insight into this matter?