@ John
Completely reasonable and well-thought, I can completely appreciate your reasoning!
I think you have made a great point though, the track is likely going to determine how well each car performs, and as for the 'Ring being the best measurement for either car, that is a tough call. Any track that lets the legs stretch a bit is going to give favor to the Corvette almost immediately, however, anything that is a bit more tight/technical may end up going towards the GT-R due to the ability to lunge ahead up to 100 MPH at insane speeds...
It will be a battle royale, but given the relative similarities already between the GT-R and the Z06, furthermore what the ZR1 adds to it, it seems more likely that the ZR1 will take the highest podium position. However, that doesn't mean its easier to do (my guess is that any jerk in a GT-R could do quite well), but I'd certainly assert that it would be more "fun" in the process.
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EDIT:
Diablo, this is neither the time nor the place to discuss pushrods and the leaf-spring setup in the Corvette. They are proven bits of technology that have worked outstandingly well, like it or not, and is questionable to the utmost degree if any changes would make the Corvette that much better. Even with its "out of date" technology, its still out-gunning cars that cost three or four times as much, and if you don't like our ass-backwards engineering, its easier to just state it as such. But to condemn it completely despite the proven effectiveness of it all, that is indeed backwards in itself.
Have no fear though, the C7 likely addresses many of these issues. The car is due to get smaller, and may in fact switch to a four-link setup out back. As for ditching pushrods, thats a case of nevergonnahappen.com all over again. Its what GM does best, and if there isn't any reason to change it, they won't. I'd bet we'll see the basic innards of the small block return with a displacement somewhere around 5.0-5.3L, direct-injection and cylinder deactivation shooting in the 400 BHP range. Give or take...
But thats still four years away.
Until then, you can get the fastest sports car made available for less than $50K with a 5 year warranty and nearly 30 MPG on the highway, or, well, you can choose not to.