Barry D Posted March 1, 2009 Share Posted March 1, 2009 Seen pictures of these but never saw one. Saw this on a auction list in Lolo MT so off i went.It was in poor shape but as you see in picture is rebuilt now. I run it about once a month when are Club meets here. On start up it sounds like a big radial. Barr Link to comment Share on other sites More sharing options...
Barry Wolk Posted March 1, 2009 Share Posted March 1, 2009 I had a '71 GMC with a 350 V-6. I believe many of the components are interchangeable with the V-12. Cool resto. Are you going to put it into anything, like a tank? Link to comment Share on other sites More sharing options...
CarlLaFong Posted March 1, 2009 Share Posted March 1, 2009 It's basicaly, two GMC V-6s on a common block. Twice as much of everything, Carbs, coils, distributors etc.If you have nothing but time and $$$$, you can do thishttp://www.blastolene.com/b702_f.html Link to comment Share on other sites More sharing options...
Dandy Dave Posted March 2, 2009 Share Posted March 2, 2009 I think it needs a big Roadster to live in! Dandy Dave! Link to comment Share on other sites More sharing options...
Dandy Dave Posted March 2, 2009 Share Posted March 2, 2009 Yeah, That's what I'm talking about... Yeah... Dandy Dave! Link to comment Share on other sites More sharing options...
jdome Posted March 3, 2009 Share Posted March 3, 2009 The engine needs some curvaceous headers instead of those dopey looking things. Link to comment Share on other sites More sharing options...
Barry D Posted March 3, 2009 Author Share Posted March 3, 2009 Most people have not known about or seen this engine is why i posted it. Im sorry you dont like it but the pipes are allmost like GM put on and i like it.2100 RPM not much of a hotrod engine. Enloy it for what it is. Barr Link to comment Share on other sites More sharing options...
R W Burgess Posted March 3, 2009 Share Posted March 3, 2009 Looks fine to me, Barr. I saw this engine somewhere else in the last year or two, but it was never set up like the one you posted. I'm aware that these "headers" were setup just to get the engine in a demonstration running condition. Love that distributor, btw! Wayne Link to comment Share on other sites More sharing options...
elcamino72 Posted March 3, 2009 Share Posted March 3, 2009 AWESOME PICTURES!I belive that these were the largest displacement production engines that GM every produced for installation into a car/truck. These came in the BIG GMC's and even some went into the "crackerbox" GMC cabovers (the crackerboxes seem to have a cult following).VERY NEAT! Link to comment Share on other sites More sharing options...
dl456 Posted March 3, 2009 Share Posted March 3, 2009 Very cool,When I first saw the Blastolene car, my buddy said that GMCnever made a 12. I remembered it being two big V-6's with a common block but had never seen one in person.I win!Anybody know what year and model trucks that had this engine? Don't know what I would do with it, but I sure would like to have one. Link to comment Share on other sites More sharing options...
R W Burgess Posted March 3, 2009 Share Posted March 3, 2009 On the order of General Motors engines, my mind went to Detroit Diesel engines, once owned by GM. I knew that there were V12 diesels around, not sure if any ever got into GMC trucks. I knew they had 8V92's and such. But, of course we're speaking of Diesel Trucks here. At any rate, I googled the subject and came up with a jewel for Dandy Dave's roadster. Might need a heavy duty frame there Dave. This "little" jewel is brand new. Can be purchased in Texas for a cool $137,900.00It's a 12V4000, usually meaning 4000 cubic inches, but with this size, who knows. It puts out 2200 HP @ 2,100 RPM. Should lay down a few stripes in the road there, Dave!!! Wayne** Link to comment Share on other sites More sharing options...
Guest Paul Christ Posted March 4, 2009 Share Posted March 4, 2009 Barr, that's an awesome engine.I have half of your engine in my truck - it's a GMC V6. More info on the "GMC Twin-Six V12" can be found on the following site (scroll halfway down, while looking on right side of page);http://www.6066gmcguy.org/Below is a photo of the GMC V12 and chassis of the Blastolene car. Beautiful. Link to comment Share on other sites More sharing options...
Guest Posted March 4, 2009 Share Posted March 4, 2009 Lots of 9500 series GMC Astros in the 70's had 12V71 Detroit diesels. In particular in Canada an 8V71 was good in the west but when you hit Ontario and could run an A or B train they could only average about 45 mph on the run from Winnipeg to Montreal. For $10,000.00 extra you could have the 12V71 and then could average whatever the speed limit was or even more. Some of the trucker managed to average over 75mph on the trip. Link to comment Share on other sites More sharing options...
junkyardjeff Posted March 4, 2009 Share Posted March 4, 2009 I was at a junkyard and seen a 60 to 66 GMC road tractor that had V12 badges so I had to pop the hood and it was the first time I seen one and when I went back about a year later it was gone. Link to comment Share on other sites More sharing options...
R W Burgess Posted March 4, 2009 Share Posted March 4, 2009 A friend of mine had a 12V71 in an International around the late 70's. Only had around 400 horsepower, not a killer at that time, but then it wasn't new.Good info guys.Wayne Link to comment Share on other sites More sharing options...
Dandy Dave Posted March 4, 2009 Share Posted March 4, 2009 Say Wayne, A big engine like that belongs in a pulling Tractor. I remember a gravel bank not far from here had a GMC Dump Truck with a 12V71 Detroit Diesel in it. You could always tell the truck was comming well before you could see it. That two cycle diesel had a very distinct sound. Dandy Dave! Link to comment Share on other sites More sharing options...
Dandy Dave Posted March 4, 2009 Share Posted March 4, 2009 <div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">2100 RPM not much of a hotrod engine. </div></div>2100 is a lot more RPM than my 1915 Buick has even when it is wide open. I was thinking more on the lines of a nice big touring roadster than a Hot Rod. Lots of hill climbing power at a low RPM. Dandy Dave! Link to comment Share on other sites More sharing options...
RocketDude Posted March 4, 2009 Share Posted March 4, 2009 I worked for a private utility company back in the early 80's that had a 12V71 generator set mounted in the bed of an old military 6X6. We used it as an emergency generator in case the electricity went out at one of our pump stations. Fortunately we didn't have to use it often, as it was a hazard to drive with all of that weight mounted so high.. That old GMC 302 automatic could barely pull the thing... We were located just a couple of miles from the old El Toro Marine Air Station, and one time I called a company to come out and run a load bank on the engine. It desperately needed to have a load put on it to clean it out... After running it on the load bank for a few minutes, it completely darkened the sky, and in no time at all the Fire Department arrived. They thought for sure a Marine fighter had gone down.. We were not very popular with the fire department, or any of the neighbors for many blocks surrounding out yard.... Link to comment Share on other sites More sharing options...
bigengineroadste Posted April 22, 2009 Share Posted April 22, 2009 ThunderV12 (Thunderv12.com) has brought these engines back to life. Check out the web site to see these engines modified to run 5,000 rpm with modern distributorless ignitions and twin 500 cfm carbs.Simply nothing else like it.bigengineroadster Link to comment Share on other sites More sharing options...
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