The chart was posted by a Corvette Forum member who says it was passed onto him by “a guy who knows a guy.” It’s a little hard to decipher and some of the engine output figures seem to be off, suggesting that this chart, assuming it is legitimate, was put together earlier on in the mid engine Corvette’s development cycle and contains preliminary engine outputs.
The naturally aspirated 6.2-liter LT2 V8 engine from the base model and Z51 of course appears on the chart, but it is also joined by a naturally aspirated, 32-valve 5.5-liter V8 that is referred to as LT6. Rated at 600 horsepower and 620 pound-feet of torque, this motor could be for the C8 Corvette Z06, though considering it is less powerful than the C7 Z06’s supercharged LT4 V8, it may also be destined for the Grand Sport or a new type of Corvette variant.
Next up is the LT7, which appears to be a twin-turbocharged version of the 5.5-liter LT6. Rated at 850 horsepower and 750 pound-feet of torque, this engine would be appropriate for the C8 Corvette Z06 or even the C8 Corvette ZR1. This is the motor we’ve heard so much about in recent months (in part thanks to our exclusive report on the new twin-cam V8) and also the same engine we believe is pictured in the leaked CAD drawings that have been floating around the internet for a year or so.
Then there’s the most powerful engine: the twin turbocharged 5.5-liter LT7 hybrid. This electrified V8 powertrain is good for a head-spinning 850 horsepower and 922 pound-feet of torque, so it seems inevitable that this is for the range-topping Corvette. Whether GM decides to call its range topper ZR1, Zora or something else remains to be seen.
All the information in the chart is on-par with well-placed rumors we’ve heard in the past, although the output numbers may not be exactly correct. The naturally aspirated 32-valve 5.5-liter LT6 engine is the same motor that was set to appear in the sixth-generation Camaro Z/28 before it was canned, so we have it on good authority that this is a legitimate engine program being worked on within GM, while we’ve already written all about the twin-turbo LT7 engine and a potential hybrid Corvette C8. Nothing in the chart is confirmed, but the info displayed doesn’t seem wildly unrealistic, either.
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Source: Corvette Forum