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The highest-output naturally aspirated engine documented here for the 2025 period is Aston Martin’s road-going Valkyrie 6.5-liter V12, rated at over 1,000 bhp. Ferrari’s naturally aspirated V12 in the 12Cilindri and 12Cilindri Spider is rated at 830 hp. These are manufacturer-published figures, in different units and conventions—not results from a normalized independent test.
How to read this 2025 comparison
This is a time-bounded selection of documented production-car examples associated with the 2025 period, not a definitive global census. It includes low-volume hypercars and naturally aspirated combustion engines used in hybrid cars, but compares engine-only output wherever possible. The cited material does not establish that every qualifying engine worldwide was captured or that each model remained available throughout all of calendar year 2025.
Published ratings retain each manufacturer’s unit label: bhp, hp, or SAE hp. Those figures should not be treated as perfectly interchangeable or as a directly normalized ranking. Availability and specifications also vary by market; the cited sources span manufacturer materials with differing dates and geographic conventions.
Leading documented naturally aspirated engines
| Car and engine | Published output | Hybrid assistance | Production-period evidence |
|---|---|---|---|
| Aston Martin Valkyrie, 6.5-liter naturally aspirated V12 | Over 1,000 bhp, according to Aston Martin’s February 5, 2025 release for the road-going engine. Aston Martin | The cited road-car engine rating is for the naturally aspirated V12; the release also discusses a race-optimised derivative, which is not the road-car specification. | Aston Martin published the road-going engine figure in a 2025 release. The source does not establish availability in every market or for the entire calendar year. |
| Ferrari 12Cilindri and 12Cilindri Spider, naturally aspirated V12 | 830 hp, as listed in Ferrari’s 2025 annual report. Ferrari annual report | No hybrid assistance is identified for this V12 in the cited report. | The 2025 report includes both cars in Ferrari’s current range. |
| Chevrolet Corvette Z06, LT6 5.5-liter naturally aspirated V8 | 670 hp. Chevrolet calls it the most powerful naturally aspirated production V8. Chevrolet | No hybrid assistance is identified for the LT6 rating. | Chevrolet announced the figure in 2024 for the 2025 Corvette Z06. |
| Ford Mustang Dark Horse (2025), naturally aspirated 5.0-liter V8 | 500 SAE hp at 7,250 rpm, per Ford’s technical specification. Ford technical specifications | No hybrid assistance is identified for this engine. | Ford publishes the rating in its 2025 Mustang technical specifications. |
Why the Valkyrie leads this documented set
Aston Martin rates the road-going Valkyrie’s naturally aspirated 6.5-liter V12 at over 1,000 bhp, making it the highest-output engine in these cited examples. This is the manufacturer’s published rating, not an independent comparison under a common test standard. Aston Martin’s release also describes a race-optimised derivative; that competition engine should not be substituted for the road-car specification.
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How the Ferrari, Corvette, and Mustang figures compare
Ferrari 12Cilindri: 830 hp
Ferrari’s 2025 annual report lists the 12Cilindri and 12Cilindri Spider as current range models and identifies their V12 as naturally aspirated. Its 830 hp figure is the next-highest published output among the non-hybrid examples in this selection. Ferrari’s unit label is retained as published rather than converted to bhp or SAE hp.
Corvette Z06: 670 hp
Chevrolet’s 2024 announcement gives the 2025 Corvette Z06’s LT6 5.5-liter V8 a rating of 670 hp and describes it as the most powerful naturally aspirated production V8. That is Chevrolet’s specific claim about production V8s, not a claim that it is the highest-output naturally aspirated engine of any configuration.
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Mustang Dark Horse: 500 SAE hp
Ford lists the 2025 Dark Horse’s naturally aspirated 5.0-liter V8 at 500 SAE hp at 7,250 rpm. It offers a useful contemporary comparison from a more broadly familiar performance-car line, but the SAE label and stated engine speed matter when setting it beside ratings published under other conventions.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Where the Lamborghini Revuelto fits
The Revuelto illustrates why a naturally aspirated engine ranking must distinguish engine output from total hybrid-system output. Lamborghini describes the car as a hybrid with a naturally aspirated V12, while its cited specification page gives 1,015 CV for combined combustion-engine and electric output. That combined figure is not the V12’s engine-only rating, so it cannot be ranked against the Valkyrie, Ferrari, Corvette, or Mustang figures as though all measured the same thing. Lamborghini Revuelto specifications
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What this list can—and cannot—establish
- Within these cited manufacturer specifications, the Valkyrie has the highest documented engine-only output: over 1,000 bhp.
- The figures are published ratings, not independent test results normalized to one measurement method.
- The sources differ in date, unit convention, and evidence of model availability; they do not support a complete worldwide ranking of every naturally aspirated engine in production during 2025.
- For a like-for-like comparison, keep hybrid-system totals separate from combustion-engine output and retain each maker’s original unit label.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
