old GMC 702 c.i.d. V-12 engine

[TEXAS-HOTROD]

Anyone here ever hear of a GMC Twin-Six engine??????
They were built in the early 1960s.

[Blue Bowtie]

Yes. They also made a V-8 and several sizes of V-6 in the same family. The Twin Six was only good for about 600 ft/lb and 300 HP, and redlined somewhere around 2,500 RPM. Weighed about a ton, too.

You can usually win a bar bet on the first year for the GM 305. Everyone will guess something in the mid-'70s, forgetting about the 305 V-6 made in 1960.

[silicon212]

Originally Posted by Blue Bowtie

Yes. They also made a V-8 and several sizes of V-6 in the same family. The Twin Six was only good for about 600 ft/lb and 300 HP, and redlined somewhere around 2,500 RPM. Weighed about a ton, too.

You can usually win a bar bet on the first year for the GM 305. Everyone will guess something in the mid-'70s, forgetting about the 305 V-6 made in 1960.

You tried to get me on that once, IIRC. Didn't work!

[777stickman]

Check out this web site for more info...........Steve

http://www.6066gmcguy.org/

[TEXAS-HOTROD]

I came across the 6066 site a long time ago, lots of gool old info. A friend of mine was engine shopping at some big scrap yard, he called me when he spotted a Twin-Six laying in a pile of other engines. So I knew exactly what it was.
It looks to be in really good shape. 2 cylinders had water in them, but since it was on propane, it's really clean inside. I'm currently getting the engine back in running condition, I just don't know how practical it would be to actually put it in something.
It's a huge block of iron, and weighs something like 1200 lbs. Though it is cool looking.

Thanks for the feed-back everyone.

[Bad81bu]

WOW thats a new one for me, I would love to see a pic of that motor.
Brett B.