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New GM 5.7 V8, 5.3 being discontinued

XLT22

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Saw some AI slop video today that there have been leaks that the 5.0 is getting upsized to 5.8 liters in 2028 with “hybrid ready” architecture. AI slop, but a good idea.

It is very much confirmed a new aluminum Hemi is in the works, it is very much confirmed GM has the 6th gen V8 coming, both for a 2027 launch so….i would imagine Ford is going to do something with the coyote to respond for the 2028 gens launch. There have been no plans made to close the plant, so naturally the product is probably going to evolve again. Exciting times!

The big change to get the coyote to 5.8 is going to be the bore tooling. That would be a pretty major upfit, but you could reuse most of the engine architecture and just scale it up (bigger valves, bigger ports etc).
There’s no new Hemi. Y’all gotta remember those types of sites are looking for clicks. The 6.4 in the HD trucks is getting updates but that’s it. The temporary addition to the Ram and soon Charger is just temporary. The Euros were kicking around a new smaller displacement V8 idea but who knows what came of it.

I would be surprised if Ford does anything but incremental changes to the 5.0. It’s such a low volume engine these days.
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JExpedition07

JExpedition07

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There’s no new Hemi. Y’all gotta remember those types of sites are looking for clicks. The 6.4 in the HD trucks is getting updates but that’s it. The temporary addition to the Ram and soon Charger is just temporary. The Euros were kicking around a new smaller displacement V8 idea but who knows what came of it.

I would be surprised if Ford does anything but incremental changes to the 5.0. It’s such a low volume engine these days.
Last two years the 5.0 made up roughly 30% of F-150 sales, 30% of 800,000 trucks is more engines than Toyota sells in the Tundra over 5 years. Easily worth investing in upgrades to retain those sales. I can tell you don’t own a business my friend, if sales were so dismal you have to bring a legacy product back you can bet you are going to have to make a new revision with further updated compliance for efficiency and continued shelf life. It’s just business sense.

You don’t spend millions on millions and whip the supply chain back in shape to bring it back for two years. There’s a new hemi coming 100%.

The I-6 hurricane doesn’t even make sense, it’s too long to package a proper parallel hybrid system. A V8 is going to serve them much better long term in the hybrid age lopping those two cylinders off the overall package length. Stellantis is European and made a mistake, we don’t displacement tax in America, you don’t win brownie points for a small engine. Our EPA is performance based. They don’t care if it’s 15 liters if it makes the mark…
 
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Highway 11

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One just hopes Stellantis has the capital to invest in a proper redesign. The lack of investment in CDJR is coming back to bite them.
 
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JExpedition07

JExpedition07

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One just hopes Stellantis has the capital to invest in a proper redesign. The lack of investment in CDJR is coming back to bite them.
Agreed, the Hurricane I-4 and I-6 was a globally harmonized platform, and a huge part of that was avoiding displacement tax in European Union market but still make US and Asia market compliance. Issue is Americans didn’t really want it that bad, and the EPA doesn’t fine you for displacement. Good effort, but there are some variable at play in the US where we don’t “fit the mold” with everyone else. Frankly, displacement tax is an outdated concept. Anyone watch TFL’s recent MPG loop? The Hurricane was worse than all the V8’s….

And the emissions output is not impressive either. Just bad EU policy leading to lackluster improvement.
 

XLT22

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Last two years the 5.0 made up roughly 30% of F-150 sales, 30% of 800,000 trucks is more engines than Toyota sells in the Tundra over 5 years. Easily worth investing in upgrades to retain those sales. I can tell you don’t own a business my friend, if sales were so dismal you have to bring a legacy product back you can bet you are going to have to make a new revision with further updated compliance for efficiency and continued shelf life. It’s just business sense.

You don’t spend millions on millions and whip the supply chain back in shape to bring it back for two years. There’s a new hemi coming 100%.

The I-6 hurricane doesn’t even make sense, it’s too long to package a proper parallel hybrid system. A V8 is going to serve them much better long term in the hybrid age lopping those two cylinders off the overall package length. Stellantis is European and made a mistake, we don’t displacement tax in America, you don’t win brownie points for a small engine. Our EPA is performance based. They don’t care if it’s 15 liters if it makes the mark…
I just work directly in the industry so what do I know. :crazy:

STLA built up a bunch of 5.7 engines before shutting down the line in Mexico for retooling. At some point they started building them again on the line that produces the 6.4. The V8 option, like in the F150 is trim limited and not intended as a long term option. It’s too dirty and not efficient. The I6 and now I4 engines on the new architecture are positioned as the volume engines going forward for the Ram half ton and upcoming midsize version. It’s a great platform that’s FAR more efficient than the Hemi and ready for upcoming emissions standards. The length of the I6 is irrelevant for the future electrified versions of that powertrain. The E-Motor goes in the transmission as in the F150 and upcoming GM electrified powertrains.

Standards are only getting tighter for gasoline engines. Despite a lot of hoopla from politicians the path forward really hasn’t changed at all. At most the new requirements may get pushed back a year or two, but all OEs are operating on the assumption the original MY deadlines are still coming. Where STLA has failed is by outsourcing so much of their engineering talent. I’m sure the Brazilian engineers are competent but not a one of them has likely ever seen let alone has the ability to buy a full size Ram. It shows in the problems faced by the current generation of that vehicle. I don’t have high hopes they’ll sort it but who knows.
 

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JCsTruck

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GM has confirmed reports that they are developing a 5.7L V8 to replace the 5.3L V8 and they are developing a 6.6L variant for performance, both without AFM. I don't know if Ford can scale up the Coyote V8 to 5.8L but they can easily do 5.2L because they already make it for the top of the line supercharged Raptor. They just need to make it NA. I believe Ford has also limited the production of the 5.0L V8 on purpose to meet CAFE standards, or at least up until now. If they allowed more 5.0L V8 engines to be produced I believe they could easily sell more.
 

XLT22

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Agreed, the Hurricane I-4 and I-6 was a globally harmonized platform, and a huge part of that was avoiding displacement tax in European Union market but still make US and Asia market compliance. Issue is Americans didn’t really want it that bad, and the EPA doesn’t fine you for displacement. Good effort, but there are some variable at play in the US where we don’t “fit the mold” with everyone else. Frankly, displacement tax is an outdated concept. Anyone watch TFL’s recent MPG loop? The Hurricane was worse than all the V8’s….

And the emissions output is not impressive either. Just bad EU policy leading to lackluster improvement.
The Hurricane platform exists because the Hemi didn’t meet current emissions regulations let alone future iterations. It could easily get better fuel economy than a V8, but that would require it to be detuned to make V8 power.
 

XLT22

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GM has confirmed reports that they are developing a 5.7L V8 to replace the 5.3L V8 and they are developing a 6.6L variant for performance, both without AFM. I don't know if Ford can scale up the Coyote V8 to 5.8L but they can easily do 5.2L because they already make it for the top of the line supercharged Raptor. They just need to make it NA. I believe Ford has also limited the production of the 5.0L V8 on purpose to meet CAFE standards, or at least up until now. If they allowed more 5.0L V8 engines to be produced I believe they could easily sell more.
They’ve done no such thing. One blog has speculated but in reality there’s next to no information available. Cylinder deactivation is staying for sure though. Unless GM pulls a miracle and makes the most efficient V8 ever they aren’t meeting the particulate or CO2 standards without cylinder deactivation.

Production of V8s is lower because the Ecoboost engines are far more popular.
 
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JExpedition07

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I live 3 minutes away from Tonawanda engine and know a lot of people within GM, the 5.7 and 6.6 derivatives are replacing the 5.3/6.2, it’s well known at this point and tooling work has been going on for a while. No company will comment on product info until launch, this is the same energy we got in 2020 from forum warriors “Ford isn’t making a 7.3 engine, it’s just a rumor they haven’t confirmed.” Nope, it happened, and we knew 3 years beforehand. You can’t keep that kind of thing under wraps.
 

JCsTruck

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The V8 scores better in the EPA's smog rating, also know as the Air Pollution Score as shown on vehicle window sticker. The V6 scores worse on the smog rating because of higher levels of nitrogen oxides [NOx], hydrocarbons [HC], carbon monoxide [CO], and particulate matter [PM] which are the key contributors to smog pollutants.

The 5.0L Coyote V8 earns a higher smog rating (e.g., 6–7/10) compared to the 3.5L EcoBoost (e.g., 3–5/10), depending on exact configuration like 2WD/4WD or California emissions standards vs. federal.

Starting in 2026, Ford is adding gasoline particulate filters (GPF) to the 3.5L EcoBoost (and PowerBoost hybrid) to address these higher smog emissions, which will slightly reduce horsepower but improve PM control and likely boost its smog rating. The V8 doesn't need this yet, as its emissions profile is already cleaner for these metrics.😁
 

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JCsTruck

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There are multiple industry reports from November 2025 confirming that General Motors is developing a sixth generation small-block 5.7L V8 engine which is intended to replace the current 5.3L in light duty trucks. However, these details only stem from insider sources and not an official GM announcement as you noted. GM has publicly confirmed only the existence of a Gen 6 small-block lineup, without specifics on sizes or features. You are correct in these reports originate from leaks and are not from a GM press release which wont happen this year.
 

XLT22

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There are multiple industry reports from November 2025 confirming that General Motors is developing a sixth generation small-block 5.7L V8 engine which is intended to replace the current 5.3L in light duty trucks. However, these details only stem from insider sources and not an official GM announcement as you noted. GM has publicly confirmed only the existence of a Gen 6 small-block lineup, without specifics on sizes or features. You are correct in these reports originate from leaks and are not from a GM press release which wont happen this year.
Generally the word gets around from suppliers first. Folks aren't always tight lipped there. ICI and Eaton being the habitual worst offenders.

Tula already announced their contract for the next gen V8s so we know that means skip-fire aka DFM is still around.
 

XLT22

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The V8 scores better in the EPA's smog rating, also know as the Air Pollution Score as shown on vehicle window sticker. The V6 scores worse on the smog rating because of higher levels of nitrogen oxides [NOx], hydrocarbons [HC], carbon monoxide [CO], and particulate matter [PM] which are the key contributors to smog pollutants.

The 5.0L Coyote V8 earns a higher smog rating (e.g., 6–7/10) compared to the 3.5L EcoBoost (e.g., 3–5/10), depending on exact configuration like 2WD/4WD or California emissions standards vs. federal.

Starting in 2026, Ford is adding gasoline particulate filters (GPF) to the 3.5L EcoBoost (and PowerBoost hybrid) to address these higher smog emissions, which will slightly reduce horsepower but improve PM control and likely boost its smog rating. The V8 doesn't need this yet, as its emissions profile is already cleaner for these metrics.😁
It only achieves that by virtue of having cylinder deactivation. The formula is convoluted and doesn't necessarily mean those outputs are lower. The test cycle data is available via FOIA if you really want to know. The 3.5 has a much higher specific output so it's not exactly apples to apples, and California emissions aren't a thing anymore. All 5L engines are 50-state engines as well as the Ecoboost twins.
 

XLT22

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I live 3 minutes away from Tonawanda engine and know a lot of people within GM, the 5.7 and 6.6 derivatives are replacing the 5.3/6.2, it’s well known at this point and tooling work has been going on for a while. No company will comment on product info until launch, this is the same energy we got in 2020 from forum warriors “Ford isn’t making a 7.3 engine, it’s just a rumor they haven’t confirmed.” Nope, it happened, and we knew 3 years beforehand. You can’t keep that kind of thing under wraps.
Buffalo isn't the only source of V8s for GM. Some of us backwards southerners build them too. :cwl:
 

gagliano7

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If GM gets rid of cylinder deactivation that will be a real plus for them. I doubt that will happen.
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