GMC V12 702ci engine

702ci V12 GMC engine, manufactured from 1960-1965. Essentially two 351 V6 engines, with a common crank and a block from a single casting. On engine stand, in tractor, and in rat rod truck. Plus old advertisement and exploded diagram.

https://www.youtube.com/watch?v=QQVjOqTa44Q

https://www.youtube.com/watch?v=qr3QdLDJfsU

https://www.youtube.com/watch?v=ia1yaWhdgn0

https://s3-us-west-1.amazonaws.com/h...GMC_V12_ad.jpg

https://s3-us-west-1.amazonaws.com/h...ed_diagram.jpg

About 20 years ago I was in a junkyard and there was a mid 60s GMC road tractor that had v12 badges so I had to look,opened the hood and seen what looked to be a V6 while thinking there has to be more if it has a V12 so I looked a little further back and seen the rest of the motor. Never knew GMC even made one and now wish I would have bought the truck.