Recently, GM hosted an event where engineers from the Chevrolet Corvette and Small Block programs gave a three-plus-hour presentation on the LT6, the engine powering the new C8 Corvette Z06. The most common point of reference throughout was the LT4, the supercharged 6.2-liter V-8 used in the C7 Corvette Z06, and currently found in the Camaro ZL1 and Cadillac CT5-V Blackwing. It’s a killer engine, though early on, it was plagued with faults.
Namely, overheating. In track use, early C7 Z06s had a habit of hitting high engine temperatures and going into limp-home mode, something that led owners to file multiple class-action lawsuits against GM. Chevy fixed the problem by raising the supercharger cover starting with the 2017 Z06, but the damage to GM’s reputation for building durable track cars was done. It was a rare miss for team Corvette, and while no one directly mentioned the LT4’s issues in the LT6 presentation, the subtext was, “we know where we screwed up with the LT4-powered C7.”
The article from Road & Track goes more in depth.