How about this theory.
The long hood had a proper 911S, the racy one, you remember it. Internally, this would have been called the 911SA, if they knew what was to come.
In 1974, Porsche built the smogged up middie models which they called the 911S strictly for marketing purposes. Internally they called it the 911SB, but never put that on the decklid.
Finaly, in 1978, Porsche got their technology sorted, and they built the last of the true 911S cars - the 911SC, only this time they called it by it's internal designation because it sounded cool.
As you can appreciate, Porsche found this a difficult story to tell, and of course not very sexy, so now they're just saying it stood for Super Carrera.
We know it can't really stand for Super Carrera though because the 1984 models that came later were arguably (hey I'm an SC fan) better in every respect, so why would they go back to calling them just Carrera? If the SC was a Super Carrera, then the model that came next should have been Super Duper Carrera or something...
I don't think we can close the book on this very important question just yet. Let's drag this on at least until the new year.
