[Rumor] Gen 6 V8's will come in 5.7 and 6.6L

[Le Monstre]

According to GM Authority, rumors suggest the next-generation (Gen 6) small-block V8s—produced at GM's Tonawanda plant with an $888M investment—will include 5.7L and 6.6L displacements.

The 5.7L is expected to serve as a workhorse for GM’s full-size trucks (Silverado, Sierra), likely replacing or supplementing the current 5.3L L84 in base and mid-tier models.

The 6.6L, however, appears positioned as a high-performance variant. Speculation points to it powering:

• The mid-engine C8 Corvette Grand Sport (replacing the current LT2 6.2L),
• A potential rear-wheel-drive successor to the Camaro (if revived),
• And the next CT5

Naturally aspirated output is rumored to exceed 500 hp, with some insiders suggesting a supercharged version could push well over 700 hp—making it a strong candidate for a future Blackwing flagship.

While nothing is confirmed, the displacement jump and performance focus align with GM’s strategy to differentiate its ICE lineup amid electrification pressure.

Thoughts? Plausible, or wishful thinking?

We Hear: GM Gen 6 Small Block V8 To Come In These Two Sizes

GM Authority is hearing an interesting new detail about the potential displacement specs for the upcoming GM Gen 6 Small Block V8, with two sizes on offer.

gmauthority.com

 

[Melon]

I wonder if this has anything to do with the current 6.6L offering in the Silverago/Sierra 2500 that's exempt from AFM/DOD and Start/Stop.

 

[1Evil55]

Have they been watching us here?

 

[Melon]

Have they been watching us here?

Probably watching the loads of failed 6.2L's rolling into their warehouse.

 

[1Evil55]

Ouch

 

[USMC1911]

Probably watching the loads of failed 6.2L's rolling into their warehouse.

As if rolling out a new design will fix any of the QC problems that have caused the failures in the 6.2.

 

[ngoni]

As if rolling out a new design will fix any of the QC problems that have caused the failures in the 6.2.

Other rumors were that they aren't outsourcing any of the engine build for the new V8s. At least if there's another recall, GM won't have any one else to point the finger at.

 

[jbawden]

It all sounds plausible to me. I do find it curious how fast they pivoted from EV back to ICE. I guess ICE is easier, cheaper, and greater customer appeal. I guess the fast pivot caveat leaves me with I'll believe the next gen non-hybrid V/Blackwing when I see it.

 

[Melon]

Other rumors were that they aren't outsourcing any of the engine build for the new V8s. At least if there's another recall, GM won't have any one else to point the finger at.

I'm sure they have had endless meetings on the subject. I hope they do fix the issues. Reliable V8's have been their bread and butter for decades. The recent debacle is definitely a black eye for GM.

 

[ngoni]

It all sounds plausible to me. I do find it curious how fast they pivoted from EV back to ICE. I guess ICE is easier, cheaper, and greater customer appeal. I guess the fast pivot caveat leaves me with I'll believe the next gen non-hybrid V/Blackwing when I see it.

When the government stops subsidizing each EV sold and also stops giving out free money to build/retrofit factories the free market realities become crystal clear. For certain urban/suburban commuters EVs are good/great options. For just about everyone else, they aren't there yet.

Relaxed CAFE standards also helped I'm sure.

 

[quikag]

According to GM Authority, rumors suggest the next-generation (Gen 6) small-block V8s—produced at GM's Tonawanda plant with an $888M investment—will include 5.7L and 6.6L displacements.

The 5.7L is expected to serve as a workhorse for GM’s full-size trucks (Silverado, Sierra), likely replacing or supplementing the current 5.3L L84 in base and mid-tier models.

The 6.6L, however, appears positioned as a high-performance variant. Speculation points to it powering:

• The mid-engine C8 Corvette Grand Sport (replacing the current LT2 6.2L),
• A potential rear-wheel-drive successor to the Camaro (if revived),
• And the next CT5

Naturally aspirated output is rumored to exceed 500 hp, with some insiders suggesting a supercharged version could push well over 700 hp—making it a strong candidate for a future Blackwing flagship.

While nothing is confirmed, the displacement jump and performance focus align with GM’s strategy to differentiate its ICE lineup amid electrification pressure.

Thoughts? Plausible, or wishful thinking?

We Hear: GM Gen 6 Small Block V8 To Come In These Two Sizes

GM Authority is hearing an interesting new detail about the potential displacement specs for the upcoming GM Gen 6 Small Block V8, with two sizes on offer.

gmauthority.com

I could totally see a 700+hp 6.6L supercharged motor for the next-gen Blackwing. My concern at that point is traction as the current BW is fairly traction limited in lower gears already.

One potentially fix is an ZR1X type set-up with an electric motor/battery at the front axle for motive traction and then a gradual torque ramp of the ICE engine driving the rear axle to keep from blowing the tires off at lower speeds. An extra 150-200lbs isn't dramatic on the weight front for a car like the BW. That could give total system output of over 800hp easily. Include the six-speed manual and I'm in.

 

[hawk02]

I'm sure they have had endless meetings on the subject. I hope they do fix the issues. Reliable V8's have been their bread and butter for decades. The recent debacle is definitely a black eye for GM.

Honestly, it’s GM’s own fault. They let the bean counters convince them to farm out crankshafts to a Mexican manufacturer with obviously questionable QC. Any savings of a buck or two per crankshaft have been completely wiped out a hundred times over by the cost of this massive recall—not to mention all the bad publicity.

Personally, I wouldn’t touch any 6.2L truck or SUV from ’19 through ’24.

 

[doublethebass]

Honestly, it’s GM’s own fault. They let the bean counters convince them to farm out crankshafts to a Mexican manufacturer with obviously questionable QC. Any savings of a buck or two per crankshaft have been completely wiped out a hundred times over by the cost of this massive recall—not to mention all the bad publicity.

Personally, I wouldn’t touch any 6.2L truck or SUV from ’19 through ’24.

are we sure it's fixed for 25+? I'm in the market for a Suburban / Yukon and have been leaning 5.3...

 

[1Evil55]

I just got into a '21 6.2 with only 5xxx miles. I opted for the extended warranty.