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Thinking out loud....
The costs of a tweaked motor, aside from something like a revised air intake, exhaust revision or a slightly more aggressive cal delivering 10 to 20 HP, or an exotic motor for a 18 month production run are mostly likely the end of that discussion before it starts. I may be wrong, but the only ready to go motor for a Z/28 is the LS7. It is our last best hope.
The C7 2014 Vette with the 5.5 DI debuts sometime in the second half of 2013. I believe they will let the C7 run with the performance version of the DI technology for at least the first model year pushing the debut of a 2015 DI Camaro into late 2014. That would have a DI powered Z/28 available for maybe 8 months?
An LS7 powered Z/28 could be released in the second quarter of 2013 when the Corvette will no longer be using it. That gives the Z/28 a solid 18 month run to the launch of the 2016 Camaro and allows LS7 production run a year longer. With all the tooling and and development costs depreciated out, LS7 production for a production car should be profitable at a reasonable cost. The sticking points are EPA and CAFE.
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