The GMC 'Twin Six' Is An Insane 11.5-Liter Four-Head V12 Meant To

The GMC Twin Six is the monstrous 11.5-liter all-American gasoline-powered V12 that you need to know about.

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GMC Twin Six V12

The Legend of GM's MASSIVE 11.5L V12 Engine

What was the GMC Twin Six?, The Daily Drive

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What was the GMC Twin Six?, The Daily Drive

The Engine Appreciation Thread (Awesome, Unique, Odd, Historic, etc..all in here)