6-speed and 8-speed automatic Corvette C7 Stingray have the highest probability of blown engines

And here is a great reason why this is the unfortunate case, at least for those buyers who face the likelihood of pushing their cars relatively hard, causing the automatic transmission to overheat.

The typical scenario where the automatic transmission can overheat would be a road course track event or so called high performance driver education course.  Of course, there are other possibilities where transmission may overheat, including "spirited" road driving, with sufficient number of "twisties" and uphill driving.

Ironically enough, no matter what +Tadge Juechter  keeps saying, none of the factory recommended (or required?) track preparation procedures can prevent these catastrophic failures from happening since the problem lies with the automatic transmission and not the engine.  Of course, anyone dumb enough to take their Stingray convertible to the road course, should go through these bullshit motions, no matter how futile they may be, to at least assure a possibility of +General Motors considering honoring warranty repairs or build a better case against GM in court.

Why are the automatic Stingray convertibles almost certain to destruct their LT1 engines (regardless of Z51 or non Z51 version) under conditions specified above?

It has been mentioned on this blog many times in the past that the automatic transmission cooling on Stingrays is completely inadequate.  Even with the Z51 option on the coupes, the size of the fans and location and size of the inlets and ducts falls short in the cooling department.  With convertibles and their lack of quarter panel located ducts and fans, this is even worse, to the point where transmission running hot is a norm.  When combined with a smaller diameter torque converter and higher stall speeds, this is a real recipe for disaster, or more accurately, catastrophic engine failure.

How does this happen?  Excessive heat equals excessive pressure in torque converter and subsequent flexing, causing force on the crankshaft well beyond its tolerance.  When this happens, the main bearings fail and if the main bearings do not fail (by some miracle), the thrust bearing fails.  In LT1, engine, the thrust bearing is not only 180 degree design but also with reduced thrust area, so there is very little to prevent the destruction of the engine, without any early warnings.  When this happens, the engine dies very suddenly and hopefully without rods penetrating the block and setting the car on fire, even though, this has already happened at least once.

How about the cars with manual transmission?  As already well documented, these cars destroy their engines during engine non related repairs, courtesy of incompetent GM dealership repair service.  Since the torque tube carrier bearings tend to fail frequently on Stingrays, the likelihood of the car having its torque tube removed and replaced is very high, thus, another opportunity to lose the LT1 engine.  If for some miracle, the torque tube lasts a bit longer, there is always a problem with the fuel tanks or differential that once again, will require removal of torque tube.

Of course when service activities are involved, it really does not matter if the car is manual or automatic, GM service incompetence knows no distinction between  body styles or transmission types.

The biggest and funniest irony here is the fact that Juechter loves to brag about slush box not being inferior to the dual clutch type of transmissions.  Hey Tadge, at least DTC transmissions do not obliterate the engines and this is exactly the price the gullible buyers of Stingrays appear to be paying, due to your own ignorance, incompetence and outright arrogance.  Ain't life a bitch, Tadge?