For the first time in 9 months of regular browsing on this forum I think I might be able to make a useful contribution. In spite of having an Austin 7 for 40+ years I only became vaguely aware of there being two types of 2 bearing rubber mounted crankcases a couple of years ago. To my surprise a rummage in my garage has produced one of each. I think both have been in my car (a Nippy) at sometime in the past.
Re the attached photo: The crankcase on the left is the lowframe one. They are sitting on a level base. The angle of the camera does give the illusion of differences which are not there. In each the distance between the top of the crankcase at the upper edge of the hole for the rear bearing is identical. One can see that when sitting in the same chassis the top of the left hand (lowframe) crankcase will sit about 1cm higher than the right one.
If it stops raining I'm happy to provide further measurements if required.
Here's the photo
Re the attached photo: The crankcase on the left is the lowframe one. They are sitting on a level base. The angle of the camera does give the illusion of differences which are not there. In each the distance between the top of the crankcase at the upper edge of the hole for the rear bearing is identical. One can see that when sitting in the same chassis the top of the left hand (lowframe) crankcase will sit about 1cm higher than the right one.
If it stops raining I'm happy to provide further measurements if required.
Here's the photo