GM Scrubs their Parts Book for Any Reference to the 2027 Corvette Grand Sport’s LS6 Engine

Dec 30, 2025

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GM Scrubs their Parts Book for Any Reference to the 2027 Corvette Grand Sport's LS6 Engine

Photo Credit: Keith Cornett

Poor General Motors. I almost feel sorry for those having to deal with the cleanup on isle ’27 relating to the recent leaks regarding the upcoming C8 Corvette Grand Sport.

Almost.

Those items specific to the C8 Grand Sport which have been reported here and elsewhere are systematically being scrubbed wherever possible. We saw GM demand a video take-down from YouTube, which reportedly offered listeners the first sounds from the upcoming 2027 Corvette Grand Sport’s LS6 engine. The real question when that happened was what did Chevy want to hide? The sound of the engine or the fact that it was outed with its LS6 engine designation?

Last week, CorvetteBlogger entered the Grand Sport chat with this screenshot from GM’s proprietary parts book which showed the details about RPO LS6. The listing showed the LS6 to be a 6.7-liter Generation Six 8-Cylinder Aluminum Overhead Valve engine with both Direct Injection and Port Fuel Injection:

Our friend JMB56 from the MidEngineCorvetteForum.com who discovered the original LS6 listing now brings us the message and screenshot showing that GM has removed the details about the LS6. He sent me this with the following message in which he says, “They got nervous just like with the LT7, here’s what the Parts Catalog looks like now lol!!!.

He was referencing the GM Parts Book leak from 2023 detailing RPO LT7, the twin tubro 5.5 Liter V8 now found in the Corvette ZR1. After that leak was revealed, GM did a stealth edit and replaced the 5.5 liter twin turbo to show the LT7 being a 4.3-liter diesel engine.

Unfortunately for us, because we could use a good laugh, GM dropped the details of the LS6 altogether instead of rebranding it as a 2-stroke lawnmower engine as we were hoping for:

LS6 is Scrubbed from GM Parts Book Following Leak

For anyone watching GM as closely as we do, seeing them change or update information that recently became public is usually an indication that the information is correct. Sure, there may be some changes that happen between now and the release of the car, but the fact that their own parts book referenced this info will have dads everywhere yelling “6-7, 6-7” just like their kids are doing these days.

With the Grand Sport expected to come for the 2027 model year, we might not have to wait too long for the official information to drop. Will we see the reveal before or after the NCM Bash in April 2026? That’s the question we’re asking.

Source:
MidEngineCorvetteForum.com

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4 COMMENTS

Michael Guy Dec 30, 2025 At 12:15 pm

GM needs to stop the silky stuff and give us the full plan for the Corvette. I cancelled my order for a 2026 Eray because it wouldn’t have the new engine and the C9 is coming. With the prices exceeding $100,000 and poor resale values, at least GM should give us enough information to plan for the future.
JWW Dec 31, 2025 At 3:03 am

It all starts with the CEO of any company so I state one more time that GM’s Mary Barra is the cause of all the nonsense coming from GM at the present time. She has a PHD in finance but absolutely “NO” production car manufacturing acumen whatsoever. GM needs to dump Barra to be able to improve car production.
Rc Dec 31, 2025 At 6:35 am

It was all a ploy to test market the GS manual C8. I think they received a lot of positive feedback and has validated the product for future production.
IPD Dec 31, 2025 At 8:15 am

The responses to this are what’s hilarious. I couldn’t really care one way or the other about what the 6th gen brings. “Cancelled my order for a 2026 ER”. Sure buddy. There’s like a thousand people waiting on 2026 ER allocations right now. I’ll take “things that never happened” for 1000, Alex.

There will always be a market for a GS. Because people who want the look without paying for the performance, dates back to the 1960’s. Nothing new here.