GMC's Remarkable Twin Six Engine: The Story Behind General Motor's

Once upon a time, GMC created a V12 monster of an engine it called the Twin Six. It was massive, powerful, and not eco-friendly in the least.
Once upon a time, GMC created a V12 monster of an engine it called the Twin Six. It was massive, powerful, and not eco-friendly in the least.

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

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Inside GMC's Mighty 702 Cubic-Inch V12 - Mac's Motor City GarageMac's Motor City Garage

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

The GMC Twin Six V12: 702 Cubes, 275 HP At 2400 RPM, 630 Ft. Lbs. At 1600 RPM - Curbside Classic