8-95 Kissel/Auburn Rear Main Oil Seal?

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All,

I am working on a 8-95 Kissel (GS Lycoming) engine that is very similar to the Auburn engines.  My rebuilder called me and asked if there was a rear main oil seal on this engine?  Unfortunately I did not take it apart (neither did he) and I cannot find any pictures or documentation on it for this engine.  He asked if it was just a slinger design that drains back to the pan.  Does anyone have any experience/pictures that could help me understand how the back of the motor is/is not sealed up?  Any help/photos/drawings would be appreciated.

John