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12-16-2008, 04:24 PM
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#1 |
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Registered User
Join Date: Apr 2007
Location: King City, Ontario, Canada
Posts: 974
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never seen it
never even seen one in person, nevermind watch one run.
how rare were they? i herd of it through this forum...but there no way these were an optional engine in our trucks right?
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- Jason If you can turn, Youre not going fast enough. Favorite caption: first car to 200 mph in the 1/4 mile, no parachute, drum brakes all the way around.. ..back when men were men. Last edited by 69halfton; 12-16-2008 at 04:25 PM. |
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12-16-2008, 04:31 PM
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#2 |
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I'm a poor spectator
Join Date: Aug 2006
Location: San Antonio, Tx
Posts: 2,287
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Re: never seen it
Idles low enough. For some reason I was waiting for it to sound off like a jet engine but then it was all quiet??!!
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2006 Jeep Unlimited IMPACT ORANGE 1993 Chevy 2500 4x4 ExCab LWB 454/NV4500 Tow rig  1977 Ford F100 2x4 LWB 1st truck I owned, still have it!!!  1979 Ford F150 4x4 SWB Built Ford Tough!!!  1971 Chevy Blazer 350 / SM465 / NP205 UNDER CONSTRUCTION Soon to have a LQ4 6.0!!! |
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12-16-2008, 04:56 PM
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#3 |
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Registered User
Join Date: Jul 2006
Location: the netherlands europe
Posts: 4,335
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Re: never seen it
there's actually one on this forum that is building one intoo a truck .
hes used to work on them in his younger days , they where used in trucks (but the big rig type of trucks ) and as irrigationpumps and are basicly two gmc V6 engines cast together . take a look on google theres plenty info about them still the blastolene bro's made a custom car with one of those engines too
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i got a job again and having fun at it too idea's for the trucks and the order of things to do are taking shape and get closer to being realized , a few more months and i be able to start building for real i complete 2 of the trucks intoo running fashion one custom and one basicly stock the thirth will be sacrificed for parts Last edited by watahyahknow; 12-16-2008 at 04:57 PM. |
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12-16-2008, 05:39 PM
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#4 |
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Senior Member
 
Join Date: Aug 2008
Location: Cedar Park, Texas
Posts: 7,500
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Re: never seen it
I posted pics of a GMC V12 that was at the Texas Early Days Tractor and Engine show this past fall in Temple. As mentioned above, they were used in big trucks and as stationary engines such as irrigation pumps and such.
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12-16-2008, 05:41 PM
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#5 |
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Senior Member
Join Date: Aug 2008
Location: Cedar Park, Texas
Posts: 7,500
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Re: never seen it
The owner started it a few times. it was not super loud. I am sure that that is because the cams used in them did not have a radical amount of lift or duration. I had a 468 BBC that was louder when I uncorked the headers. Still pretty cool for thw "WOW" factor of a V12.
Last edited by WIDESIDE72; 12-16-2008 at 05:42 PM. |
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12-16-2008, 06:04 PM
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#6 |
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Registered User
Join Date: Oct 2007
Location: greeneville tn
Posts: 237
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Re: never seen it
Some how those two small carbs look out of place . First one i have seen .
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12-16-2008, 06:08 PM
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#7 |
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The LuvShack Garage
Join Date: Jan 2004
Location: Maple Grove, TN (West Side)
Posts: 30,468
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Re: never seen it
Here's the thread linked just below of the build on here
 http://67-72chevytrucks.com/vboard/s...d.php?t=254111
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Owner/Op: "TN Classic Transport Carriers" The Toy: "Square Vette" 72 Hybrid Blazer Toy Barn: "LuvShack" 40 x 60 x 20 Shop Tow Piggy:"Maddy" 88 Silverado 3500 Hauler: "Feathers" 14 Aluma 8218T |
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12-16-2008, 09:56 PM
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#8 |
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Registered User
Join Date: Jun 2008
Location: Moss Point,Ms.
Posts: 1,439
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Re: never seen it
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. 
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12-16-2008, 11:59 PM
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#9 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,690
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Re: never seen it
GMC had V8 offerings back then too, they just didn't build them in house, there was factory installed pontiac engines in the 60's in light duty GMC trucks.
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12-17-2008, 12:29 AM
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#10 |
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Registered User
Join Date: Apr 2007
Location: King City, Ontario, Canada
Posts: 974
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Re: never seen it
hey longhornman, about how many of these motor were made?
in either irrigation or in heavy trucks? love your road trip stories by the way  i haven't really had time to look anything up, but i would assume these motors were built to make torque, not horsepower. they probably never even spun much over 3000 rpm, if that. 
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- Jason If you can turn, Youre not going fast enough. Favorite caption: first car to 200 mph in the 1/4 mile, no parachute, drum brakes all the way around.. ..back when men were men. Last edited by 69halfton; 12-17-2008 at 12:30 AM. |
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12-17-2008, 06:54 AM
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#11 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,690
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Re: never seen it
i have nothing on these things... sorry
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12-17-2008, 11:41 AM
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#12 |
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Old Skool Club
Join Date: Jun 2001
Location: Benton, AR "The Heart of Arkansas"
Posts: 10,880
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Re: never seen it
Until 1960 and the change in body styles, GMC used bigger straight-6's (261 and 302), than Chevy (235 and 261), but they also used Pontiac and Buick engines. I had a '38 GMC half-ton that used a Pontiac 226-cid flathead six. Larger styles used larger engines. My '58 Chevy truck shop manual also referred to other engines that were used, including Buick V-8's and Pontiac V-8's. These were in addition to the diesels that were offered and used. The '55-second series and '56 GMC had as an option, Pontiacs' 287 V-8, then followed up with the 347 in '57.
I guess that was the lure that GMC had, the availability of larger engines in the same body, plus a slight change in styling.
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Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was. |
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12-17-2008, 11:44 AM
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#13 |
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Resident of Here
Join Date: May 2008
Location: Wesley Chapel, FL, USA
Posts: 7,716
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Re: never seen it
GMC produced a large gasoline-burning V12 from 1960 to 1965 for trucks, the "Twin-Six"; it was basically GMC's large-capacity truck 351 V6, doubled, with four rocker covers and four exhaust manifolds. 56 major parts are interchangeable between the Twin-Six and all other GMC V-6 engines to provide greater parts availability and standardization Its engine displacement was 702 in³ (11.5 L), and while power was not too impressive at 250 SAE net horsepower (190 kW), torque was 585 lb·ft (793 N·m). It was possibly the last large gasoline engine used in heavy trucks in the United States.
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~Bradley~ 2004 Black GTO LS2/T56 too much to list Miss having a truck 
Last edited by thirdstreettito; 12-17-2008 at 11:47 AM. |
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