GMC Twin Six V12

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What was the GMC Twin Six?, The Daily Drive

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

Custom Replica with a GMC V12 and Boeing T50 Engine - engineswapdepot.com

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

Rap'em Pappy A 1964 GMC V-12 Tribute To A WWII Bomber