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GM pours billions into U.S. combustion-engine plants as EV momentum stalls

GM pours billions into U.S. combustion-engine plants as EV momentum stalls

Built World

A $150 million Saginaw casting investment is the latest in over $5 billion GM has committed to domestic ICE production since mid-2025

April 2nd, 2026: GM invests $150M in Saginaw plant for next-gen V-8 casting

Overview

General Motors is spending more than $150 million to retool a century-old casting plant in Saginaw, Michigan, for the company's next-generation 6.7-liter V-8 engine. The plant has poured engine blocks since 1919 and now employs about 300 workers. In 2027, it will begin producing components for the sixth-generation small-block V-8 destined for the Chevrolet Silverado HD and GMC Sierra HD pickup trucks.

The Saginaw investment adds to more than $5.5 billion GM has committed to U.S. combustion-engine manufacturing since mid-2025. For a company that once pledged an all-electric future, this is a sharp pivot.

With EV sales down 43 percent in late 2025, federal tax credits eliminated, and emissions rules relaxed, GM and its rivals are pouring capital back into the internal-combustion supply chain. They're retooling foundries, expanding truck assembly lines, and hiring for engines they had planned to phase out.

Why it matters

GM's renewed bet on combustion engines signals that the U.S. auto industry's electric transition has slowed by years, not months.

Questions about this story

0

Is the new investment targeted at fixing the issues with the L87 V8?

The Saginaw investment funds a brand-new sixth-generation engine that replaces the L87 — not a repair of it — but the L87's catastrophic failure scandal has made reliability the defining test for the Gen 6's credibility.

Why it matters: The L87 debacle — a bearing defect causing sudden engine seizure in nearly 600,000 vehicles — is now in consolidated class-action trial, so the Gen 6 carries reputational stakes well beyond a typical product cycle.

  • The L87 6.2L (Gen 5) has a bearing defect that causes sudden engine seizure with no warning; NHTSA Recall 25V-274 (April 2025) covers roughly 600,000 Silverados, Sierras, Tahoes, Suburbans, and Escalades.
  • A consolidated class action was filed February 26, 2026 and is now in trial; as of January 2026, at least 36 owners reported engine failure even after the recall remedy (oil-viscosity change + warranty extension).
  • The Gen 6 6.7L targets 4–6% better fuel efficiency than the 2022 L87 and 10–12% over the original 2019 version, with GM explicitly citing reliability improvements after Gen 5 issues.
  • The Saginaw plant begins casting Gen 6 blocks and heads in 2027, first for the Corvette (535 hp), then for the Silverado HD and Sierra HD — the same truck lines most exposed by L87 failures.
Sources
GM Authority — Gen 6 Small Block family Pickup Truck Talk — L87 federal probe expansion Carscoops — consolidated L87 lawsuit Lemon Law Experts — 2026 lawsuit updates
Room for disagreement
  • GM has not publicly stated the Gen 6 was redesigned to fix the L87 bearing defect — the new engine was in development before the recall emerged, so some analysts frame the Gen 6 as a planned generational upgrade that happens to arrive amid the L87 crisis, not a direct engineering response to it.
AI-generated with web search — may be wrong. Check the linked sources.
0

I say a youtube video that said that some of the GM v6 engines in current cars are breaking early and at an alarming rate. Is that true?

The alarming early-failure story is actually about GM's 6.2L V8, not the V6 — over 28,000 engine failures were documented before GM issued a recall, and the NHTSA is now investigating whether that recall fix itself is failing.

Why it matters: If the recall fix on GM's flagship truck V8 isn't working, hundreds of thousands of Silverados, Tahoes, Suburbans, and Escalades remain at risk of sudden engine seizure while moving.

  • GM's internal records counted 28,102 reports of 6.2L L87 V8 failures between April 2021 and February 2025 — roughly half while vehicles were in motion — before a recall was issued covering 2021–2024 Silverado, Tahoe, Suburban, Sierra, Yukon, and Escalade.
  • The root cause: manufacturing defects in connecting rod machining and crankshaft dimensions left metal sediment in oil galleries, starving bearings.
  • The NHTSA opened a formal investigation in early 2026 after owners reported engines failing again even after receiving GM's official fix — both the oil-change remedy and full engine replacements have been implicated in post-fix failures.
  • GM's 3.6L V6 has its own long-documented issues — timing chain stretch on early variants and oil consumption up to 1 qt per 2,000 miles — but these are not a new wave; they've been known for years and are not the subject of a current alarming failure surge.
Sources
The Autopian — L87 failure count and recall background GM Authority — NHTSA post-recall investigation AutoGuide — recalled 6.2L V8s still failing after fix Rx Mechanic — GM 3.6L V6 known problems
Room for disagreement
  • GM has not publicly conceded that its recall fix failed — the company's position is that the repair procedure is sound, while owner complaints and the NHTSA investigation challenge that claim.
AI-generated with web search — may be wrong. Check the linked sources.
Play on this story Voices Debate Who Said What? Predict

Key Indicators

$5.5B+
GM U.S. manufacturing investment since mid-2025
Cumulative capital committed to domestic plants, overwhelmingly for combustion-powered vehicles
$150M
Saginaw casting plant investment
Funds new equipment and tooling for sixth-generation V-8 engine blocks and cylinder heads
535 hp
Sixth-gen small-block V-8 output
The 6.7-liter engine is the most powerful naturally aspirated V-8 GM has ever mass-produced
-43%
GM EV sales decline, Q4 2025
Year-over-year drop following expiration of the federal $7,500 EV tax credit
107 years
Saginaw plant age
One of GM's three oldest operating facilities in the United States, founded in 1919

Voices

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Predict 3 ways this could play out. Contrarian picks score more — points lock when the scenario resolves. Log in to play
Timeline Five events from this story — drag them oldest to newest. Log in to play
Connections Sixteen names from the news. Find the four hidden groups of four. Log in to play

People Involved

Mary Barra
Mary Barra
Leading GM's dual ICE-EV strategy
 Tony Mann
Tony Mann
Representing Saginaw plant workforce

Organizations Involved

General Motors (GM)
General Motors (GM)
Automaker
Actively investing in U.S. ICE manufacturing while maintaining EV commitments

The largest U.S. automaker by domestic market share, operating dozens of manufacturing plants across North America.
United Auto Workers (UAW)
United Auto Workers (UAW)
Labor Union
Supporting renewed ICE investment as job protection

The union representing most hourly workers at GM, Ford, and Stellantis plants in the United States.

Timeline

January 2023 April 2026

6 events Latest: April 2nd, 2026 · 2 months ago
Tap a bar to jump to that date

  1. GM invests $150M in Saginaw plant for next-gen V-8 casting

    Latest Investment

    GM committed over $150 million to retool the 107-year-old Saginaw Metal Casting Operations plant for sixth-generation V-8 engine blocks and cylinder heads, with production starting in 2027.

  2. GM reveals sixth-gen V-8 in 2027 Corvette

    Product

    GM unveiled the 6.7-liter, 535-horsepower sixth-generation small-block V-8 as the engine for the 2027 Chevrolet Corvette Stingray and Grand Sport.

  3. GM adds $250M for Parma Metal Center

    Investment

    The Parma, Ohio facility received a $250 million commitment, bringing GM's 2025 U.S. manufacturing investments to nearly $5.5 billion.

  4. GM announces $4 billion in U.S. plant investments

    Investment

    GM committed $4 billion to expand domestic production capacity beyond 2 million vehicles per year, with new gas-powered vehicle lines at plants in Michigan, Kansas, and Tennessee.

  5. Barra signals willingness to boost gas vehicle output

    Strategy

    CEO Mary Barra told investors GM would "happily" increase gas-powered vehicle production if EV demand weakened further.

  6. GM commits $918M for sixth-gen V-8 engine across four U.S. plants

    Investment

    GM announced $918 million for V-8 production at Flint Engine ($579M), Bay City ($216M), Defiance, Ohio ($55M), and Rochester, New York ($68M).

Historical Context

2 moments from history that rhyme with this story — and how they unfolded.

2009-2012

GM's Saturn shutdown and Spring Hill repurposing (2009–2012)

GM killed the Saturn brand during its 2009 bankruptcy and shuttered the Spring Hill, Tennessee assembly plant that had been purpose-built for it in 1990. After a $300 million retooling, the plant reopened in 2012 to build Chevrolet Equinox crossovers—a completely different vehicle on a different platform.

Then

Spring Hill lost 3,000 jobs during the shutdown period before rehiring for the new line.

Now

The plant remains operational today and is now slated for another retooling to build gas-powered Blazers, demonstrating how legacy plants can be repeatedly repurposed as strategies shift.

Why this matters now

Saginaw's retooling follows the same pattern: an aging plant gets new life when corporate strategy changes direction. The question is whether the new investment creates lasting stability or just delays the next pivot.

2000-2015

Diesel's comeback and collapse in European automaking (2000–2015)

European automakers invested heavily in diesel technology as a lower-carbon alternative to gasoline, with diesel reaching 55 percent of new car sales in the European Union by 2012. Volkswagen, BMW, and Mercedes built entire product lines around diesel efficiency. Then Volkswagen's 2015 emissions-cheating scandal destroyed consumer trust overnight.

Then

Volkswagen paid over $30 billion in fines and buybacks. Diesel's market share began a steep decline across Europe.

Now

Billions in diesel-specific manufacturing infrastructure became stranded assets as cities banned diesel vehicles and regulators tightened standards. The episode accelerated Europe's pivot to electric vehicles.

Why this matters now

GM's renewed combustion investment carries a version of the same risk: capital committed to a powertrain technology whose regulatory and market future is uncertain. If policy or consumer preferences shift again, these factory investments could face the same stranding dynamic.

Sources

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