Which Viper has a V12?

The short answer is: none. No production Dodge Viper uses a V12 engine; all production Vipers are powered by a V10. There have been concept studies and rumors about a V12 Viper, but none reached production.

Engine lineage and production realities

The Dodge Viper family is defined by its high-revving V10 powerplant. From the original RT/10 introduced in the early 1990s through the final 2017 model, every factory Viper used a V10, with the displacement evolving from 8.0 liters to 8.4 liters over time. While enthusiasts and designers occasionally speculated about a V12 variant, Dodge’s official production lineup stayed with the V10 configuration.

Production Viper generations and engines

Here is a concise look at the Viper generations and the engines they used. Note: every production Viper employed a V10.

• RT/10 (early 1990s): 8.0 L V10


• Viper GTS (mid to late 1990s): 8.0 L V10


• SRT-10 (early to mid-2000s): 8.3 L to 8.4 L V10


• Viper TA/ACR and other variants (2008–2017): 8.4 L V10

In short, there has never been a production Viper with a V12. Any references to a V12 tend to be rumors or concept studies that did not progress to an actual road car.

V12 concept stories and rumors

Over the years, some show cars and media reports have circulated about a V12 Viper concept. These were unofficial studies or marketing showcases rather than production vehicles. Dodge did explore various high-performance configurations in concept form, but none culminated in a V12 Viper for sale.

Why the V10 stayed central

Choosing a V12 would have introduced extra weight, cost, and packaging challenges. The Viper’s appeal rests on a compact, high-torque, high-revving V10 mounted in a lightweight chassis. For a car aimed at raw, driver-focused performance, the incremental benefits of a V12 did not justify the added complexity within Dodge’s competitive landscape.

Summary

The Dodge Viper’s legacy is built on the V10 engine, not a V12. Production Vipers—from the RT/10 to the final Viper model produced before the 2017 discontinuation—rode on V10 powerplants. While rumors of a V12 exist in automotive folklore, they never translated into a production Viper.

What is the biggest engine in the Dodge Viper?

The biggest Dodge Viper engine is the 8.4-liter V10, which was used in the fifth and final generation of the car. This naturally aspirated engine produced 645 horsepower and 600 lb-ft of torque, making it the largest production car engine in the world at the time. 

• Displacement: The final generation of the Viper featured an 8.4-liter (8,488 cc) V10 engine. 
• Horsepower: It generated a maximum of 645 horsepower. 
• Torque: The engine delivered 600 lb-ft of torque. 
• Significance: This engine is notable for being the largest production car engine in recent history and for delivering massive torque without the use of forced induction. 

How much horsepower does a 8.3 L Viper have?

500 hp at 5,600
Engine Type: 8.3L V10. Horsepower: 500 hp at 5,600 rpm. Torque: 525 lb-ft at 4,200 rpm. Displacement: 8,285 cc.

What Dodge had a V12?

2016 Dodge Viper ACR V12 from the Ferrari F12 TDF supposedly something like this wouldve been Ferrari's nightmare they said if the Viper had over 700hp it would've broke the 7min record at the Nurburgring which would've humiliated them.

Is there a V12 Viper?

No, the production Dodge Viper has never been made with a V12 engine; it exclusively used a V10. However, there is speculation and rumors about a future V12 version, possibly a limited-edition "Mamba" model, that could be a hybrid and is expected to be released around 2026. 
You can watch this video to learn more about the rumored 2026 Dodge Viper V12: 47sAutoTrend YouTube · Jul 5, 2025
History of the Viper engine

• The Dodge Viper has always been powered by a V10 engine. 
• The V10 engine was developed by Chrysler but had aluminum castings designed by Lamborghini. 
• The last generation of the Viper ended production in 2017. 

Future V12 Viper speculation

• There are rumors and speculation about a future Viper that could include a V12 engine. 
• One potential version is a limited-edition "Mamba" model that is expected to be a hybrid and a high-performance supercar. 
• This V12 model is speculated to be released in 2026. 
• The V12 engine is rumored to be a hybrid system, with an estimated combined output of around 1,0001 comma 0001,000 horsepower. 

This video discusses the rumors about a V12 Mamba edition of the Viper: 58sTK's GarageYouTube · Apr 27, 2025