What's the highest horsepower concept vehicle ever produced by GM?

Cadillac Cien

Cadillac Sixteen.

Cadillac Cien

Cadillac Sixteen.

You're both off by about 2,000hp.

Some sort of locomotive then?

GM Hybrid Bus?

A version of the engine was used in trains, but this version of the engine was not. Think bigger than a train or bus.

Your mama?

GMTruckGuy74 mentioned the company's name in the Faceoff! thread, and Chevrolet built a semi tractor by the same model name between 1968 and 1988.

1946 Aero Packard Flyer “Dream Rod” with 2000Hp 41-liter Engine

http://autoworld.wor...e-photos-video/

That is freaking awesome

Amazing that the noise level goes down as the engine warms up with those open heads.

Edited April 27, 201213 yr by dfelt

Still 1,300hp short of this thread's mystery truck.

Terex Titan 33-19. Now on display in Sparwood, British Columbia. 3,300 Horsepower.