GM’ s Prototypes and rare cars.

Video taken at GM's Heritage Center. Inside You can discover models old and brand-new, and some really uncommon collectible cars.

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Why V4 engines are so rare and which cars use them – Mike’s Mechanics

The V4 engine is such a rare design in a road cars and truck, being found mainly instead in bikes. Mike has actually examined how the V4 engine works and why it is so unusual, as well as researching the ultimate usage of this unusual engine, the Porsche 919 Hybrid…

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