G.M.C.made their own engines in the 60's/70's.If you bought a new G.M.C. truck in the 60's with anything bigger than an I-6,you got a V-6---305,351or larger,up to the 702.G.M.C. also sold their own diesels.
The 702 is a combination of 2 351 blocks.4 seperate heads,4 exhausts manifolds,2 intake manifolds,2 carbs and a special dual distributor.Note only one water pump,because it is one of the highest volume pumps made.
702 in video appears to be on propane and for use in big trucks.702 in pictures runs on gas and is set-up for stationary use.
Designed for use in G.M.C.'s big trucks like cab-over type over-the -road haulers.
U.S. govt. used these 702 engines in the big trucks that hauled I.C.B.M. missiles in the early 60's.
I have a 305-E and a 351-C and would love to have a running 702.
This site has some more on this motor:
http://www.6066gmcguy.org/
Mike.
