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10-31-2007, 05:19 PM | #1 | ||
Eat My Rust
Join Date: Jan 2007
Location: Cypress, Texas
Posts: 3,362
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The mother of all engines, the GMC Twin-Six V12
I love the thought process you had to have for this motor back in the day: "So today, we need to make an engine with loads of torq-" "Lets stick two of our small-block V6s together with bullet proof parts!!!" "Brilliant!" It was featured on Jalopnik.com as the Ass-Kickin' Engine of the Day Quote:
Found more info at http://www.6066gmcguy.org/TwinSix.htm http://www.6066gmcguy.org/Jolly-702v12.htm Quote:
It made 275hp @ 2400 rpm, and 630 ft lb or torque @ 1600-1900 rpm Please tell me someone here has one Last edited by texanidiot25; 10-31-2007 at 05:20 PM. |
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10-31-2007, 05:37 PM | #2 |
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Re: The mother of all engines, the GMC Twin-Six V12
I have two.....on my spec sheet that's been kicking around for 20 years. Pretty cool. I always wondered what they looked like.
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'69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, 2nd owner, Work-Truck supreme. Best $300 I ever spent. |
10-31-2007, 05:50 PM | #3 |
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Re: The mother of all engines, the GMC Twin-Six V12
Please tell me someone here has one[/QUOTE]
Check "cayoterun" see his posts , he has lots of pics ! GMC V-12 powered '91 Chev crewcab ( 1 2 3 4)
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"I feel the need for speed!"... as soon as I am done with my nap. Last edited by NONHOG; 10-31-2007 at 05:56 PM. Reason: added link ? sp |
10-31-2007, 05:52 PM | #4 |
Eat My Rust
Join Date: Jan 2007
Location: Cypress, Texas
Posts: 3,362
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Re: The mother of all engines, the GMC Twin-Six V12
Sure will.
I really want to hear this thing too... but I cant find any video. |
10-31-2007, 07:20 PM | #5 |
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Re: The mother of all engines, the GMC Twin-Six V12
Hello--
Hope to submit a video, with sound, before tooo long,but as posted, project posponed due to family illness. Last pic posted is where we are. It shouldn't be too far from running when we can get back to work. Join us with this project, and give your ideas. Thanks Cayoterun Oh, save a post. What's the wheelbase on a 1ton Xcab- late 80s, early 90s???
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Cayoterun Okla. Panhandle I think I'll do it myself and pay the extra $500. |
10-31-2007, 08:38 PM | #6 |
its all about the +6 inches
Join Date: Jan 2001
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Re: The mother of all engines, the GMC Twin-Six V12
someone had a photo of one in front of a junk yard.
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10-31-2007, 08:53 PM | #7 |
Self-proclaimed LED man
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Re: The mother of all engines, the GMC Twin-Six V12
Here ya go longhorn. Pretty sure this is the one you are talking about.
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My LED Website My Photobucket Album of LED's Ask me about hand-made custom L.E.D brake and reverse lights. <- LINK I also do LED: -Third Brake/Cargo -Brake (truck and burb) -Reverse (truck and burb) -67-68 Front Turn Signals -69-70 Front Turn Signals -71-72 Front Turn Signals -GMC Front Turn Signals I can also do custom lights for other vehicles....i did a set for a AMC Gremlin once Norwood Survivor |
10-31-2007, 09:23 PM | #8 |
I have a radical idea!
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Re: The mother of all engines, the GMC Twin-Six V12
I have a coiuple of 305 V6's and a 351 Magnum V6, but no V12's. I don't what the hell I'd do with it, but I'd love to have one!! Here's some more pics, ads and drawings. A bad crank out of one of these would make a killer mailbox post wouldn't it??
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'67 C-30 Dually Pickup 6.2 Turbo Diesel, NP435 ‘72 C-10 SWB , 350 4bbl, TH350 '69 C-10 SWB , 250 L6, 3 OTT '69 GMC C3500, dump truck, 351 V6, NP435 '84 M1009 CUCV Military Blazer 67 C-30 Turbodiesel build thread http://67-72chevytrucks.com/vboard/s...d.php?t=254096 My trucks http://s226.photobucket.com/albums/d...ediafilter=all Member of the 1-Ton Club! |
10-31-2007, 09:27 PM | #9 |
I have a radical idea!
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Re: The mother of all engines, the GMC Twin-Six V12
Oh, I almost! The coolest GMC V-12 powered vehicle on Earth!!! The B-702!
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'67 C-30 Dually Pickup 6.2 Turbo Diesel, NP435 ‘72 C-10 SWB , 350 4bbl, TH350 '69 C-10 SWB , 250 L6, 3 OTT '69 GMC C3500, dump truck, 351 V6, NP435 '84 M1009 CUCV Military Blazer 67 C-30 Turbodiesel build thread http://67-72chevytrucks.com/vboard/s...d.php?t=254096 My trucks http://s226.photobucket.com/albums/d...ediafilter=all Member of the 1-Ton Club! Last edited by 67_C-30; 10-31-2007 at 09:30 PM. |
10-31-2007, 09:29 PM | #10 |
I have a radical idea!
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Re: The mother of all engines, the GMC Twin-Six V12
Then there's Frankenstein!!
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'67 C-30 Dually Pickup 6.2 Turbo Diesel, NP435 ‘72 C-10 SWB , 350 4bbl, TH350 '69 C-10 SWB , 250 L6, 3 OTT '69 GMC C3500, dump truck, 351 V6, NP435 '84 M1009 CUCV Military Blazer 67 C-30 Turbodiesel build thread http://67-72chevytrucks.com/vboard/s...d.php?t=254096 My trucks http://s226.photobucket.com/albums/d...ediafilter=all Member of the 1-Ton Club! |
10-31-2007, 09:54 PM | #11 |
Still Truckless!
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Re: The mother of all engines, the GMC Twin-Six V12
Gotta love the giant motor.
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10-31-2007, 09:56 PM | #12 |
its all about the +6 inches
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Re: The mother of all engines, the GMC Twin-Six V12
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10-31-2007, 10:28 PM | #13 |
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Re: The mother of all engines, the GMC Twin-Six V12
I was gonna say the 702 would be awesome in a rat rod.Talk about funky obscure.
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
10-31-2007, 11:03 PM | #14 |
Chevys Kick A$$
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Re: The mother of all engines, the GMC Twin-Six V12
Wow thats pretty kool. Not very burly motor but defiantly unique as all get out.
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11-01-2007, 02:03 AM | #15 |
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Re: The mother of all engines, the GMC Twin-Six V12
I would love to have one of those and turn it in to a cofee talbel or maybe a bar.
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Earl 68 2500 4x4 GMC Burb |
11-01-2007, 04:43 AM | #16 |
Dirteh Kitteh
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Re: The mother of all engines, the GMC Twin-Six V12
I would love to have one of those to put into a truck that could handle it for hauling firewood.
12 chords at a time!!!
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Darrin 1955 Willys CJ-5 all original and the oldest CJ-5 on the road. 2001 Dodge Neon (wife's car) 1995 Jeep Grand Cherokee Limited Edition SOLD 1981 K15 Custom Deluxe 4X4, rusty but trusty wood hauler. SOLD 1993 S-10 4X4 Tahoe SOLD Sign up with the Contact List RIP ESLL |
11-01-2007, 04:52 AM | #17 |
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Re: The mother of all engines, the GMC Twin-Six V12
that would be one long truck
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Earl 68 2500 4x4 GMC Burb |
11-01-2007, 05:27 AM | #18 |
Dirteh Kitteh
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Re: The mother of all engines, the GMC Twin-Six V12
Nah, just mount the radiator on the front of the support (more towards the grill) and chop and channel the firewall to make a bigger bell housing hump. I mean, they put inline sixes in these trucks, all that engine is is two I-6's sharing a crank.
Ok, maybe it's a little bit longer, but not by much, is it?
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Darrin 1955 Willys CJ-5 all original and the oldest CJ-5 on the road. 2001 Dodge Neon (wife's car) 1995 Jeep Grand Cherokee Limited Edition SOLD 1981 K15 Custom Deluxe 4X4, rusty but trusty wood hauler. SOLD 1993 S-10 4X4 Tahoe SOLD Sign up with the Contact List RIP ESLL |
11-01-2007, 05:33 AM | #19 |
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Re: The mother of all engines, the GMC Twin-Six V12
I would think its at least 4ft.
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Earl 68 2500 4x4 GMC Burb |
11-01-2007, 07:14 AM | #20 |
STILL PLAYS WITH TRUX
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Re: The mother of all engines, the GMC Twin-Six V12
Here ya go TI25
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11-01-2007, 08:59 AM | #21 |
Dirteh Kitteh
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Re: The mother of all engines, the GMC Twin-Six V12
Hrm, got me thinking here. It's a little more than 4 ft from the radiator support to the firewall on my truck.......
Nah, my old 1/2 ton would never handle it.
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Darrin 1955 Willys CJ-5 all original and the oldest CJ-5 on the road. 2001 Dodge Neon (wife's car) 1995 Jeep Grand Cherokee Limited Edition SOLD 1981 K15 Custom Deluxe 4X4, rusty but trusty wood hauler. SOLD 1993 S-10 4X4 Tahoe SOLD Sign up with the Contact List RIP ESLL |
11-01-2007, 09:15 PM | #22 |
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Re: The mother of all engines, the GMC Twin-Six V12
Length: 5' from tip of water pump to edge of flywheel housing.
Check www.6066gmcguy.org in the pic. gallery. I think its a '63 cab-over. One nice truck w/23,000 mi on it. Belonged to the Wisconsin Forest Service and was only used to pull a water supply tanker to fire trucks since new. Owner did a great job restoring it. When he shows it, he or his wife take turns going to eat as someone is asking questions about the motor all day long. Some really sincere, but amusing. Cayoterun
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Cayoterun Okla. Panhandle I think I'll do it myself and pay the extra $500. Last edited by cayoterun; 11-01-2007 at 09:25 PM. |
12-21-2017, 06:49 PM | #23 |
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Re: The mother of all engines, the GMC Twin-Six V12
Check out thunder v12. They build high performance engines
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12-22-2017, 11:47 PM | #24 |
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Re: The mother of all engines, the GMC Twin-Six V12
Check "cayoterun" see his posts , he has lots of pics ! GMC V-12 powered '91 Chev crewcab ( 1 2 3 4)[/QUOTE]
The pic is the end product of my '46 Chev pu. It's all sitting on an '84 GMC 3/4 ton running gear. It has a 700R4 auto tranny mated to it. I grafted all the ps, pb over on it, from the '84. To repeat from the build thread, that engine sit on an irrigation well for 22 years with only one .30 over overhaul pumping 2200 gallons per minute. I cared for it for about a year working for the farmer, and it won my respect for being a tough old critter. I always like to watch the fire out all 4 exhaust pipes, and manifolds glowing cherry red when I checked just before bed time at night. It's started and driven a for a mile or two now and then just to stay lubed, but living a pampered life snuggled down in the corner of my farm shop. I have it on propane, but it burned natural gas when on the well.
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Cayoterun Okla. Panhandle I think I'll do it myself and pay the extra $500. |
12-23-2017, 07:42 AM | #25 |
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Re: The mother of all engines, the GMC Twin-Six V12
This b-model belonged to a great local GMC enthusiast, Fred Craig,who passed away some years back. This was in '07 when I took the pictures. I wonder where it went to when sold. It's out there somewhere.
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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