Here’s a look at seven of our favorite secret V-12 prototypes and other one-off models, and our take on how they could have changed the automotive world if they’d been allowed to enter production.

The V6 is one of the most venerable engine configurations, but this special five-pot engine managed to outlive all its period ...

Jeeps have a reputation for being tough and comfortable on and off the road. Over several decades, though, even they've made ...

The naturally aspirated V6 engine, once a staple in performance and luxury sedans, is on the brink of extinction as ...

Service records looked fine, but this 3.0L Duramax teardown uncovered timing chain chaos, broken rockers, and a ruined bottom ...

While pickup trucks are known for their wide array of capabilities, including off-road adventures, hauling heavy loads, and ...

Throughout its history as a carmaker, Honda has built numerous iconic production models, but also several jaw-dropping ...

This indestructible six-cylinder leans on its simplicity and over-engineering to keep going when turbo engines give up.

The Nissan Altima is a strong and dependable daily driver, and the last to feature a V6 engine and manual gearbox is a steal ...

The VQ38DD V6 has built a reputation for reliability, but as we’ve seen, a single overlooked component can sometimes lead to ...

The Buick Regal Sport Coupe and LeSabre Sport Coupe joined a Saab and a Porsche as the only production turbo cars available ...

Before the inline-four became the go-to default engine and the V6 was compact enough to fit into small engine bays, the four-wheeled automotive world saw the V4 as a brilliant compromise. It was ...