A leaked document is creating quite a stir and raising some intriguing questions surrounding the C8 Chevy Corvette. Specifically: Could the next-gen Vette make up to 850 horsepower (edging out the Dodge Demon's demonic 840 hp)? Will the C7 Corvette remain in production for years after the mid-engine C8 hits the streets? Might the C8 get three engine choices, with not just one but two of them DOHC?

Take a gulp of coffee and ponder all of that.

Corvette Forum is citing a document shared by a forum member, which is purported to be a forecast of engine production from analysts IHS Markit that spells out Chevy's near-term plans for the Corvette, or rather, Corvettes plural.

Mind you, this is all pretty speculative since we can't know the veracity of the document, and a lot of earnest interpretation and numbers-crunching by forum members is also involved, but here's what the forum has gleaned from it:

— The mid-engine C8 Corvette, expected to be revealed at the Detroit auto show, will have three V8 engine choices: the current 6.2-liter V8, along with a 4.2-liter and a 5.5-liter, both of those DOHC, both of them twin-turbo.

— Production of the two DOHC engines has already begun at GM's Tonawanda powertrain facility in Buffalo, N.Y.

— Interestingly, IHS Market predicts the 6.2L to be the main choice of buyers, projecting 14,000 units per year before its popularity starts to taper off. That number appears to be exclusive to the C8 and doesn't seem to include that engine's application in the C7 since GM sold 40,000 units of that car last year.

— The DOHC engines would be more exclusive, with the 4.2-liter produced at a rate of 7,000 per year, and the 5.5L at 5,000. By the way, there's no correlation in the document between engines and trim levels.

— Forum members have sussed out that the 5.5-liter engine could make 850 horsepower and 720 pound-feet of torque — so likely, that's the ZR1. They reckon the output of the 4.2L at around 650 horsepower.

— The document mentions a use case for the 4.2-liter engine in a "Cadillac Sports Car," but at numbers so low, the folks at the forum think it must be only for racing. Or maybe not.

— And finally, the current front-engine, rear-drive C7 Corvette will live on for perhaps three more years, with motor production scheduled to continue through 2021.

We'll get confirmation on any or all of the above when the mid-engine Corvette is expected to hit the floor at the North American International Auto Show in January.

Corvette Forum has scored three coups in the past month concerning Chevrolet's next-generation sports car. The latest leak is a CAD drawing of a longitudinal, DOHC, twin-turbo V8 that could be one of the three rumoredpowerplants sliding into the mid-engine 'Vette's engine bay. In an earlier leak, a detail showing the V8's turbocharger came labeled as "Gen6 LT7," leading sleuths to believe this is the sixth-generation of GM's small-block V8 architecture, dubbed LT7.

As gearhead tweeter Bozi Tatarevic pointed out, the illustrated V8 drawing shares cues with the 3.0-liter, TT V6 LGW engine used in the Cadillac CT6, such as turbocharger placement and belt configuration. The turbos hang on the sides of the engine instead of lying in the V between the cylinder banks, with plumbing running from the turbos up to water-to-air intercoolers atop the banks. That feature is, again, the same as on the Cadillac TT V6. Also of note, it appears as if the exhaust manifolds are cast into the cylinder heads. We can't figure out displacement, but one of the recent Corvette leaks laid out a plan for three V8 engines: the current 6.2-liter V8, and two DOHC twin-turbo V8s, one 4.2 liters, the other 5.5-liters.

We await the reveal of the new coupe and some certifiable information at next month's Detroit Auto Show.

I just hope the mid engine vette does not suffer from GM cheap it out syndrome.

Years ago I thought they would be the only US company able to bring something to compete with the Europeans (I am not just talking about fast, I am talking about the total package). I was totally wrong as Ford did the job.