5 Minutes
New V8 era at GM: what we know
General Motors appears to be moving forward with a new generation of V8 engines, and recent leaks suggest the Chevrolet Corvette Grand Sport will be among the first to receive one. The news follows the arrival of the 5.5-liter twin-turbo LT7 that powers the Corvette ZR1 and ZR1X — a watershed moment for Corvette, marking the first production model with forced induction in decades.
From LT6 to LT7 — and now a 6.7L contender
The LT7, derived from the naturally aspirated LT6, uses a flat-plane crank and extensive revisions to block, heads and intake to host twin turbos. With outputs north of 1,000 hp and more than 800 lb-ft of torque, the LT7 made the ZR1 the most powerful production V8 from an American automaker.
But the Corvette lineup doesn't stop there. Enthusiast forums and parts-book leaks indicate a different direction for the Grand Sport: a larger, naturally aspirated or mixed-injection 6.7-liter V8 listed in GM’s parts database. The entry was described as: "engine gas, 8 CYL, 6.7L, DI, PFI, OHV, ALUM, GEN 6," which decodes to a sixth-generation, aluminum-block V8 with overhead valves and both direct and port fuel injection — an architecture aimed at a balance of torque, efficiency and emissions compliance.
Why an OHV 6.7L?
Switching to an OHV (pushrod) design for a high-displacement V8 makes sense for several reasons:
- Packaging: OHV engines are more compact, helping weight distribution and packaging in mid- and front-engine layouts.
- Low-end torque: Pushrod V8s excel at producing usable low- and mid-range torque, valuable for both sporty driving and truck applications.
- Cost and durability: OHV cores tend to be simpler and robust for higher-volume use across different models.
The reported dual-injection setup (DI + PFI) points to a modern approach that mitigates carbon buildup and improves both cold-start emissions and high-load performance — useful whether the engine is shoehorned into a Corvette or shared with Silverado 1500 variants.
Possible LS6 resurrection and RPO hints
Rumors also suggest GM may revive the LS6 name for part of this GEN-6 family, a nod to the brand’s performance heritage. The info surfaced via a MidEngineCorvetteForum user who spotted future RPO (regular production option) codes tied to the 2027 model year. Historically, GM parts-book leaks have proven prescient — the LT7 was foreshadowed in a similar leak in 2023.
"A 6.7L Grand Sport would give Corvette a different character: more torque and a broader powerband," one forum poster observed, underscoring how engine choice shapes driving personality.
Resale policy and market context
When the ZR1 entered production at Bowling Green this year, GM enforced a one-year resale restriction intended to stop immediate dealer flipping. The policy included warranty voiding for cars resold within the first year. Despite that, a notable number of owners have listed ZR1s on the used market, suggesting the measure has had limited deterrent effect.
Expect similar resale restrictions on the Grand Sport if GM follows the same playbook when the model launches, likely during 2026. That timing aligns with RPO listings pointing toward 2027 model-year configurations.
What to expect under the hood and on the road
If the 6.7L GEN-6 V8 arrives in the Grand Sport, anticipate:
- A torque-rich character, emphasizing mid-range thrust
- Mixed DI/PFI fueling for cleaner emissions and durability
- Potential use across Chevrolet’s performance and truck lineup
Final thoughts
GM’s engine strategy looks flexible: a high-strung twin-turbo LT7 for headline-grabbing horsepower, and a stout 6.7L OHV option that could broaden appeal with torque, efficiency and cross-platform use. Whether the Grand Sport wears the LS6 badge or a new code, the next Corvette generation promises interesting mechanical diversity — and 2026 should bring clarity.
Highlights:
- LT7 proved GM can build turbocharged Corvette V8s
- Leaks show a possible 6.7L GEN-6 OHV V8 for the Grand Sport
- Expect resale restrictions to mirror the ZR1 policy
Stay tuned: the Grand Sport’s engine choice will shape the Corvette’s next chapter in both performance and market positioning.
Source: autoevolution
Comments
Armin
is this even true? parts-book leaks were right before, but resurrecting LS6 name feels like nostalgia. also resale rules again? ugh dealers gonna flip.
v8rider
Wow didnt expect GM to play both sides: insane LT7 turbo power, and a big 6.7 OHV option? If true the Grand Sport could feel like a torque monster, but hope it still sounds mean.
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