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

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

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

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

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

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

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