Under the hood of this 1966 Chevrolet Impala SS sits a mysterious engine.

There are plenty of surprises in the Chevrolet Impala SS. Additionally,  

the 1966 model sports an enigmatic engine beneath the hood.  

Its outside is black, its inside is blue, and its engine's horsepower is unknown.  

This Impala SS is an intriguing vehicle in addition to being sly.  

The owner says it's a secret and it lacks any badges or labels identifying the type of engine.

This Impala SS is an interesting vehicle with an enigmatic engine hidden under the hood.