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The Burtz seal is a "lip seal" as are most modern oil control seals. The lip design allows for more axial movement without developing a leak. There is an even better design that I think is called a "clip seal" that wraps around the crankshaft and is secured with a latching clip. I have heard of its use in A and B engines but have never seen photos or instructions on how it is installed or the part numbers, etc. One guy told me that he simply filled the associated cavities in the upper and lower cap with anaerobic RTV and dropped in the crankshaft with the clip seal already mounted and bolted it up. Sounded almost too simple to me but he claimed it to be very effective.