Jump to content

6.6L or 6.7L ?

Zane
 Share

Recommended Posts

Zane Senior Enthusiast

Zane

Posted
Posted

2027-chevy-corvette-grand-sport-gsx-hero.jpg

2027-corvette-6-7L-LS6-v8-engine-close-up.jpg

The rumor mill is pretty wild these days. We've heard from reliable sources that 6.6L was mentioned during the dealer update conference, however today Chevrolet released the 6.7L LS6 for 2027. It will land in the Corvette Grand Sport and also be the standard engine for the Corvette. 
Leaks from Dealer Meeting:  https://www.gm-trucks.com/2027-chevy-silverado-leaks-5-7l-v8-1000-mile-range/
Grand Sport and LS6 Info: https://www.gm-trucks.com/2027-corvette-grand-sport-6-7l-ls6-v8-reveal/

Since the top level Silverado/Sierra engine has traditionally been the same as the base Corvette engine- does that mean the 2027 Silverado/Sierra will get a 6.7L V8? Or are they bucking the trend and splitting up the displacements? 6.6L for trucks and 6.7L for Corvette?

 

newdude Senior Enthusiast

newdude

Posted
Posted

I'm gonna lean to a split.  I could be completely wrong though.  

 

5.7 (350 ci) and 6.6 (400 ci) for the trucks and those will be Tonawanda is my guess. 

 

LS6 6.7 we know for sure is Flint per the press release for the 2027 Grand Sport.  

 

The details of the gen 6 engines is what I REALLY want.  We know AFM is in the LS6 now.  We also know that these have dual fuel injection (port and DI).  

Badbird2000 Enthusiast

Badbird2000

Posted
Posted

Just give me a 409 in a truck... 

I hope they use the 6.7 liter myself... for both

  • Like 1
Epsilon Plus Enthusiast

Epsilon Plus

Posted
Posted

I'm already hearing the dreaded "350" nomenclature returning which took years of hearing boomers constantly mis-sizing the LS1 as one. Let's wait until confirmation before throwing that ol trope around.

 

As far as the current L8T.... 400 or 401? Do the CI math with published inch bore/stroke and you have a 400. Do it with the punished mm bore/stroke and it's a 401. Just happens to have 401hp too which GM has occasionally, historically, matched to inch displacement.

 

With GM being metric everything from the 90s on, I'd wager the MM 401ci is real truth.

 

All this to say, nobody really knows the displacement until after confirmation, and well, even then it's foggy.

newdude Senior Enthusiast

newdude

Posted
Posted
4 hours ago, Epsilon Plus said:

I'm already hearing the dreaded "350" nomenclature returning which took years of hearing boomers constantly mis-sizing the LS1 as one. Let's wait until confirmation before throwing that ol trope around.

 

As far as the current L8T.... 400 or 401? Do the CI math with published inch bore/stroke and you have a 400. Do it with the punished mm bore/stroke and it's a 401. Just happens to have 401hp too which GM has occasionally, historically, matched to inch displacement.

 

With GM being metric everything from the 90s on, I'd wager the MM 401ci is real truth.

 

All this to say, nobody really knows the displacement until after confirmation, and well, even then it's foggy.

 

 

Coyote 5.0 is 4,951 cubic centimeters/302.1 cubic inches.  Just like the old 5.0 was 4,942 cc/301.6 cubic inches.  

 

4.9 liters doesn't sell...5.0 and 302 sell.  Just like Vortec 5.3, 6.0 and 6.2 sold.  Nobody walked into the dealer for an HD pickup asking for a 2500HD with the 364 engine.  

  • Like 1
smit303 Enthusiast

smit303

Posted
Posted

I bet they asked for a 409 in a C10 back in the 60's though.

  • 2 weeks later...
newdude Senior Enthusiast

newdude

Posted
Posted
On 4/3/2026 at 9:08 AM, smit303 said:

I bet they asked for a 409 in a C10 back in the 60's though.

 

 

Impossible as the 409 was never offered in the C/K pickups 😉

 

They'd have asked for a 283 or 327 small block in a 1st gen C/K (60-66), a 396 big block or a 400 big block (which was really a 402ci) in a 2nd gen C/K (67-72) or a 400 or 454 big block in a 3rd gen (73-87).

shift_grind Enthusiast

shift_grind

Posted
Posted
On 3/31/2026 at 3:33 PM, newdude said:

 

 

Coyote 5.0 is 4,951 cubic centimeters/302.1 cubic inches.  Just like the old 5.0 was 4,942 cc/301.6 cubic inches.  

 

4.9 liters doesn't sell...5.0 and 302 sell.  Just like Vortec 5.3, 6.0 and 6.2 sold.  Nobody walked into the dealer for an HD pickup asking for a 2500HD with the 364 engine.  

 

Everyone says they're 302s but since 2018 they're 307s. Any bigger and they'd be a 5.1 

 

But it's like a Ls1, where everyone says they're "350s"

  • 1 month later...

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Recently Browsing   0 members

    • No registered users viewing this page.

  • Forum Statistics

    250.4k
    Total Topics
    2.7m
    Total Posts

  • Member Statistics

    342,739
    Total Members
    8,960
    Most Online
    JimmyB4
    Newest Member
    JimmyB4
    Joined

  • Who's Online   0 Members, 0 Anonymous, 625 Guests (See full list)

    • There are no registered users currently online

  • Latest Articles

  • Posts

    • Another JR
      Trim level custom/pro

      By Another JR · Posted

      Are you going to take long trips in it?  If so, try out the seats in the various trims. For me the lower trim level seats were not comfortable. 
    • mikeyk101
      2014 - 2018 Chevrolet Silverado/GMC Sierra

      By mikeyk101 · Posted

      I have a 2016 that I bought new and still own. I'm around 129,000 miles now. The biggest problem was a transmission failure about 2 years ago around 95000 miles. No warning, just failed while driving down a back road. A reman GM transmission installed and it's been fine ever since. A few other minor problems along the way. I am in no hurry to replace it. It's been paid off long ago and do plan on driving this as long as I can.   I will admit I am leery about all the additional electronics in the newer models and feel that it is just more potential problems. I think there's actually more than I would have wanted in this 2016 but so far so good. I think even if something major like lifter failure happened, it would still be cheaper to at worst, drop a new engine in than buy a new vehicle. 
    • KARNUT
      OCI, not when but why?

      By KARNUT · Posted

      I’ve own several successful businesses. I’ve bought homes and lived in different states. I’d witness several generations buy homes and survive in different economic circumstances. You get awful sippy when people have different experiences than you do. You live a life. I’ve lived a life. It seems our experience has been different. You can point out generalized statistics. Some people learn how to thrive when the odds are against them. Living in different states does make a difference in a persons quality of life and economic outcomes and opportunities. That’s a fact Jack. It’s my truth, my life. Hard work and long hours the right environment made my families life easier. And yes moving to a different state increased the odds of that happening. Stats are generalized. People who thrive don’t make excuses. They beat the odds. Others get mad and point to those statistics. I guess that’s you. My post pointed out how you helped people beat the odds. Somehow your panties got in a wad. Go figure. 
    • MrChips
      Road Master Active Suspension

      By MrChips · Posted

      Good question, I don't remember for sure but I believe it was the HD. I will check and get back to you.
    • Grumpy Bear
      OCI, not when but why?

      By Grumpy Bear · Posted

      Point of the post sir was that while both wages and cost are rising EVERYWHERE; the cost is rising faster EVERYWHERE than the ability to buy EVERYWHERE. We're not going down the location rabbit hole. I'm aware of what economic migration is. I've lived in four states including Texas.   It's what "Purchasing Power" means.   I'm not telling you what I think. I'm telling what the government, your government, data shows.   It wasn't an argument. It wasn't a suggestion. It was a statement of FACT. You are absolutely entitled to your own opinion. Your not entitled to your own facts. If you and I were, they wouldn't be facts.    fact /făkt/   noun Knowledge or information based on real occurrences. "an account based on fact; a blur of fact and fancy." Something demonstrated to exist or known to have existed. "Genetic engineering is now a fact. That Chaucer was a real person is an undisputed fact." A real occurrence; an event. "had to prove the facts of the case." The American Heritage® Dictionary of the English Language, 5th Edition • More at Wordnik   If you'd like to disagree call your Senator or Representative and let him know his departments are in error. But you and I? We are not doing this. 

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...