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Continental C85-12 Oddity

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Joined
Apr 7, 2019
Messages
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Ok Cub Brain Trust. Let’s see what you got.

I have a C85-12 with a strange case. It has a flat un-machined boss on top (see image). And after purchasing a new lifting eye (P/N 24879) to replace my abused existing one (see image), I realize that the case bolt spacing is different. What do I have here and what is the pad for?

The story from the logs was this engine started life as a C75-12 and was changed to a C85-12 in the late 1940’s.

The knowledgeable people around me say the same thing, that they read somewhere about this question and nobody can remember the answer.

Any help would be appreciated.
 

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