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Hey Jeff: I believe that you may be wrong about the C-85 in a "C" model. I
have not researched it myself, but Ed's article about Ercoupe's states
"conversion to 85 hp engines. For model C, see A-718, section Engines and
Engine
Accessories, paragraph 110."
I would check that paragraph, and use that with your FAA specialist to
ensure you get your approval for the C-85.
There are even a few C models with the 90 HP engine, and my
understanding is if you provide a 337 approved prior to 1956, that is the
engineering
data required for the change.
Lynn Nelsen
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