Back in 1960, GMC Trucks designed its own unique V12 engine, comprised of two 351 ci ... to 1965 in the heavy-duty truck line, with a 702 ci (two 351s) capacity that produced 275 hp and a mighty ...

However, one piece of the history of high-displacement GM engines that’s often forgotten is its V12. Specifically, the GMC “Twin Six,” a 702-cubic-inch (11.5L) V12 offered on GMC 7000 series ...

but GMC knew they could do one better. They needed an engine with cubic inches, and lots of them. So they took the basic design from their 5.7L V6 and made a monstrous 11.5L V12. This was not just ...

GM unveiled the mighty Twin SIX V12 derived from two new V6 engines, a perfect addition to the automaker's lineup of new truck engines. The result is an 11.5-liter (702.4 cubic inches) V12 with ...

General Motors is known for its legendary cross-plane V8 engines ... V12 and throw regular V6 parts at it to make it work. As it turns out, that was actually a solid plan, and the GMC 702 ...

Remaining faithful to the V12 recipe, the two Blastolene brothers chose the 702-ci (11.5-liter ... Manufactured by General Motors' GMC division from 1960 to 1966, the engine was originally ...

The first was a 368-ci ... the engine was based on the architecture of the brand's iconic Series 452 V16. Twenty-three years after Caddy's V12 was discontinued, GM siblings GMC developed another ...

General Motors has been putting V6 engines in its ... members of the truck-only GMC V-6 family. Available in displacements from 305 to 637 cubic inches (and a mighty 702 cubic inches for the ...

Q: Greg, I recently found an article you wrote about the GMC V-12 ... sells the 702 cubic-inch Thunder V-12 to this day and has excellent information on their site about this engine and the ...

The result is an 11.5-liter (702.4 cubic inches) V12 with four ... expect from an 11.5-liter V12, and it is nowhere near as powerful as the most potent engines GMC has built.