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The best-supported answer is Ferrari’s 166 Inter, introduced as a road car in 1948, with a V12 in the 2.0-litre class. Ferrari’s published figure of 1,995.02 cc, however, is for the related 166 S—not a specification that the available Ferrari source directly assigns to the 166 Inter. That makes the 166 Inter a strong candidate, rather than a conclusively verified all-manufacturer record.
Why the Ferrari 166 Inter is the leading candidate
Ferrari identifies the 166 Inter as its first road car and says it was produced in 1948. That road-car distinction is central to answering the question: the smallest V12 engine in a racing car is not necessarily the smallest V12 fitted to a customer road car.
Ferrari’s official technical history for the related 166 S lists a front-longitudinal, 60-degree V12 displacing 1,995.02 cc—about 2.0 litres. The figure supports the 166 Inter as the leading candidate, but it should not be presented as a displacement directly confirmed for the Inter itself: the cited Ferrari specification names the 166 S.
What counts as a production car?
For this comparison, “production car” means a road-going car made for customers, rather than a racing engine or one-off competition prototype. A smaller V12 from motorsport does not take the record under that definition.
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#1 Best Overall
Mould King V12 Engine Model Kit that Runs, MOC Engineering Model Building Kit with Battery and Motor, 3472 PCS STEM Engineering Building Blocks for Adults
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Ferrari distinguishes its first racing car, the 125 S, from the 166 Inter, which it identifies as its first road car. Likewise, Honda’s 1,495 cc RA271E was a Formula One racing engine, not a production-road-car engine. Its smaller capacity is interesting context, but it is not a road-car counterexample.
How the 166 compares with other V12s
| Model or engine | Displacement | Why it matters |
|---|---|---|
| Ferrari 166 S | 1,995.02 cc | Ferrari’s official specification for this related model provides the strongest displacement evidence for the 166 Inter candidate. |
| Honda RA271E | 1,495 cc | A 1964 Formula One racing engine, not a production road-car engine. |
| Lamborghini Miura V12 | 3,929 cc | A road-car comparison with a substantially larger V12. |
These figures do not establish a complete census of every limited-production road car ever built. They show why the answer depends on keeping road-car eligibility separate from racing-engine capacity—and on distinguishing the 166 Inter from the 166 S when quoting a specification.
Quick Recap
Best Value
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Sources
- Ferrari’s 166 S history and technical specifications
- Ferrari’s account of the 166 Inter as its first road car
- Honda’s history of the RA271E Formula One engine
- Lamborghini’s Miura history
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