I don't think that there will be an LT9. The other DOHC TT V8 was called the LT7 (1st picture below) in one of the earlier Mid-engine Corvette leaks. That engine did not feature a Hot-V design, and it did have the full exhaust system on it, including the same tips as the test mules. I expect that to be a higher displacement engine with bigger turbos compared to the LTA. However, there was ANOTHER leaked engine picture that everyone forgot about. It may have been a cancelled design, but it doesn't match the LTA or LT7. It's the second picture below, and it has a single throttle body but appears to have dual air intakes, and no turbocharger is present. It doesn't appear to be supercharged, either. Its air intake system opens toward either side of the engine, which makes it seem like the engine would go in the back of a vehicle and suck in air from small intake holes on either side of the car. Its heads appear to be too small for DOHC, so I'm wondering if it's just a new LT1(LT2?).
GM obviously has some DOHC and turbocharged V8 engines on the way, and expect to see on in a Camaro by gen 7. In fact, I bet that the Gen 7 ZL1 will have a Twin Turbocharged DOHC V8, and that it will have more power and torque than the LT4 throughout the rev range. If you think that Turbo engines don't sound good, watch this:
0:57 for cold start, 5:24 for revs, 7:29 for on-road sounds. Keep in mind that it has a stock performance exhaust system.
Really good:
One more:
http://https://www.youtube.com/watch?v=z8Pf2NGJcSs
