How big? Put it like this: think C7 Corvette Z06.
Just about everyone was disappointed by the new Cadillac CT5-V and CT4-V. Both are underpowered and not exactly worthy successors to the CTS-V and ATS-V. The good news is that about a month ago we learned that neither one was the top performance dog. A new moniker would be created for Cadillac's true upcoming BMW M sedan fighters. Although it has yet to officially be confirmed, sources claim the name Blackwing has been chosen.
Blackwing, conveniently enough, is the name of the Cadillac-exclusive 550-hp 4.2-liter twin-turbo V8 in the new CT6-V. So, what will power the also upcoming CT5-V Blackwing and CT4-V Blackwing? According to Motor Trend's Jonny Lieberman, via Instagram, the former will NOT receive the Blackwing V8 but rather the 6.2-liter LT4 supercharged V8, the very same engine powering the outgoing C7 Corvette Z06 and CTS-V.
It produces 640 ponies in the latter and Lieberman's sources say that will likely increase to around 670 hp. But best of all - best of all! - is this: a six-speed manual. You read that correctly. Row your own gears, folks. Expect Cadillac to offer an automatic option, likely a 10-speed, as well. Both the CT5 and CT4 ride on GM's excellent rear-wheel-drive Alpha platform which was engineered from the beginning to accommodate a manual. The current Chevy Camaro also utilizes this platform.
So, what about the CT4-V Blackwing? Well, it's also slated to receive a manual option, but not the LT4. What about the 6.2-liter LT1 V8 currently used in the C7? Nope.
Instead, Cadillac is going with another familiar engine: the 3.6-liter twin-turbo V6. Yes, the very same engine used in the ATS-V, where it produces 464 hp and 445 lb-ft of torque. Not that we're complaining about any of this but why isn't Cadillac opting for the twin-turbo V8 instead? Our best guess: because it's not powerful enough. The LT4 still has some life left in it despite the C7's retirement. There's still no official announcement from Cadillac but we've reached out to them for any additional comment.
And one last thing: Lieberman also stated, and despite those earlier claims, the Blackwing name may not even be used at all for the high-performance CT5-V and CT4-V. Honestly, all we care about are powerful engines and manuals.