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.

Powered by GMC Twin-Six V12

GMC Twin Six V12

A Look Back at the 702ci GMC Twin-Six V12 Engine

LY6-Powered 1966 GMC 1000 Fenderside Pickup for sale on BaT Auctions - closed on January 7, 2023 (Lot #95,285)

What It's Like Off-Roading And Sleeping In The Bank Vault-Like 'Off-Grid Trailers Pando 2.0' Camper - The Autopian

What It's Like Off-Roading And Sleeping In The Bank Vault-Like 'Off-Grid Trailers Pando 2.0' Camper - The Autopian

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

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

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

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