Why GMC 702 is the Largest V12 Nobody Talks About

The GMC Twin Six 702 is one of the largest gasoline V12 engines General Motors ever built, and yet it's an engine that nobody talks about today, buried in the history of 1960s heavy trucking. The video traces how this 11.5-liter, 702-cubic-inch monster came to exist: in the late 1950s, as America's interstate boom demanded bigger, tougher hauling engines, diesel was emerging as the smarter long-term choice for fuel economy and durability, but it was still too costly and unfamiliar for many fleet operators. GMC's answer was to scale up gasoline power instead, by fusing two of its 351-cubic-inch V6 engines into one unified, one-piece V12 block rather than two engines bolted together.
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