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.

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

The cast-iron madness of GM's 11.5-liter V-12 - Hagerty Media

Car News Archives - Page 277 of 1046 - The Autopian

Do semi-trucks have V12 engines? - Quora

The cast-iron madness of GM's 11.5-liter V-12 - Hagerty Media

GMC's Low RPM Gasoline 11.5-litre V12

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GMC Twin Six V12

Commercial Vehicles Archives - The Autopian

GMPhotoStore - The GMC Twin-Six is the GM V12 engine you probably never heard of. Built with a specific 12 cylinder block and crankshaft, the Twin- Six used two sets of V6 pistons

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

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

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Only One New Car In America Actually Sold For Under $20,000 Last Month - The Autopian

GMC's Low RPM Gasoline 11.5-litre V12