Internal leaks at GM briefly exposed a new LS6 V8 and a 2027 Corvette Grand Sport, but Chevrolet quickly removed the references from its parts catalog and dealer codes. This mirrors past secrecy around the ZR1 and adds weight to the idea that a larger pushrod C8 is quietly in the works.
Although a new Corvette Grand Sport hasn’t been officially announced, Chevrolet is already working hard to obscure it. After internal leaks pointed to a new LS6 V8 and a 2027 C8 Grand Sport, GM quietly began removing those references from its systems, a cleanup that’s only intensified fan speculation.
The story began when enthusiasts noticed a new Gen 6 “LS6” V8 listed in GM’s internal parts catalog. For a short time, the entry showed a 6.7-liter small-block engine with both direct and port fuel injection, marked for 2027 Corvette models. Separate leaks tied that engine specifically to a future C8 Grand Sport.
Adding to the intrigue, dealer systems revealed Grand Sport-specific RPO codes, including a Z15 Heritage Package, under the 2027 Corvette section. Then a development car appeared in a now-deleted video, with an exhaust note unlike any current C8. Together, these hints suggest more than just forum speculation.
Once screenshots of the LS6 listing spread online, GM seemingly moved to contain the leaks. Forum users checking the catalog in late December found the LS6 entry completely removed.
One longtime member joked, “the Parts Catalog Manager got reamed,” posting that “all reference to ANYTHING has been deleted” and comparing it to GM’s past effort to hide the LT7 ZR1 engine. Moderators were warned to “save the screenshots while you can.”
This kind of response is typical of a company trying to put the genie back in the bottle. It also fits a pattern, Chevrolet has been manipulating numbers and codes within the existing C8 lineup. When an LS6 entry briefly appears, disappears, and becomes a joke among insiders, it starts to feel less like an error and more like a preview that leaked too soon.
Of course, none of this is an official confirmation. GM could still adjust displacement, branding, or timing before the car reaches showrooms. What these leaks and deletions make clear is that a new pushrod V8 is far enough along to exist inside GM’s internal tools, and it’s strongly tied to a 2027 C8 Grand Sport package.
