I just bought this 702 GMC V12 twin 6

Found this on Craigslist this morning. Owner says it ran 20 years ago but is now stuck. What do you think? Was on an irrigation well it hole life and ran on propane.

 

And I don't know why I bought it.

 

Cool...never saw anything like that. Whatcha gonna do with it?

 

Funny looking things arnt they.
Theres one in the rear of an old truck being built and theres a thread, or info somewhere here. Have you done a search, because i remember reading several posts about the truck.
Also, Elvis from "RodBods" in Australia has one in a 32 coupe, and you can find several u tube vids of it.
Id do a search for you, but im sposed to be working. lol.

 

Couldnt resist a quick search. Here you go.

http://youtu.be/KU1lV7Qkm4o

 

Try some Marvel Mystery Oil and Sloans Linament in the cylinders for awhile. It should be in good shape if it had run on propane, as long as the bootom end is okay. Good luck>

 

I think it is cool, never seen one before.

 

Heavier than hell ,in trucks about 2MPG loaded and not much better empty. Make a hell of a mailbox stand.

 

I have had 3 of them over the years. Very cool.

 

Fit that in a rod. It would be cool on a stretched chassis.

 

Thats a new old one on me, but cool.

 

that baby should be able to crush a mustang2 fea

you better get a few oil wells to afford the fuel it uses

 

I see blowers

 

There's a guy in town here that builds them, if you need any parts or info.

http://www.thunderv12.com/

 

Very heavy, no fuel mileage, friggin' HUGE --- sounds like a project engine to me!

 

http://www.6066gmcguy.org/
Lots of variants of this motor, sixes and twelves. Prolly a bit heavy for a car...
702- 1485 pounds! 275 hp @ 2400 rpm, 630 ft/lb @ 1600- 1900 rpm.

 

That is one big SOB, I have worked on a few natural gas pump engines over the years, propane should be much the same as far as wear goes. In my experience the gas engines run very clean, the crankcase should be pretty clean, and the cylinders wear well. The valves will tend to recess even with hardened seats, and this engine will probably have run the equivalent of hundreds of thousands or millions of miles as we would often run these things for 3 or 4 (or more) months non stop year after year.

That engine will be thirsty, I had a 67 1 ton truck with a similar 305 V-6 that struggled to get 5 mpg....

 

They got a dyno video clip on this sight.
Turn up the speakers

 

I'm building up a 305 bored .040 over for my project, your engines little baby brother!

 

Very specific bell housing for them. It's a clamshell housing specific to gmc sixes and twelves, should be able to find one, though

 

i know why...... because!

 

This was at Columbus Goodguys this year,

 

I like it!!!!!!!!

 

Use it to power a fed.

 

Honestly I wouldn't know what to do with it.

 

Yeah, but it very cool looking and I saved it from the Iron guy. I haven't a clue what I'll do with it but It isn't going to China!!!!

 

word!

 

there was a write up in the Rod & Kulture mag one or two back. The one with the green Church Van on it.






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