Gmc 702 c.i. V12 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

chrismoore701 · 03-01-2010, 03:31 PM

Thats right a GMC V12. Check out this link, they are bringing them back, not sure if they will fit in our trucks, but I bet some of you guys can make it fit.

http://www.thunderv12.com/

68Timber · 03-01-2010, 04:17 PM

2400 rpm peak power with the stock cam, closer to 3000 rpm peak power with their "HP" cam. Cool novelty item though.

willett · 03-01-2010, 05:25 PM

http://thunderv12.com/power

i dont know davey.....

STOCKISH · 03-01-2010, 05:31 PM

Pretty cool looking. I'll stick to my 6.0 though. LS POWAAA

Pyrotechnic · 03-01-2010, 07:21 PM

http://67-72chevytrucks.com/vboard/s...d.php?t=254111

There's one in a truck.

*C-10 simplex* · 03-01-2010, 08:42 PM

This is actually on my "to do" list.

The way i would do it would be to move the cab back and shorten the bed; It actually looks pretty good in my mind and if i get around to it i'll make up a sketch and post it.

gchemist · 03-01-2010, 09:04 PM

Fact: GM is now selling the latest in engineering technology, the LS9 supercharged V8 crate engine. It is a marvel. Yet with all the advancements and the addition of a supercharger, the advertised torque of 604lb-ft has not caught the 630 lb-ft that GMC advertised in 1960 for the stock 702 V12! And in our opinion, the looks of the V12 is still un-matchable. We have seen the LS9 for sale at $4,000 more than a ThunderV12. Wow! We are sure the LS9 is also a good looking engine, but until someone removes all the beauty covers and other "stuff" so we can see the actual motor, we won't know for sure.

Justin36 · 03-01-2010, 10:09 PM

It looks like two v-6's bolted together in the middle

dbmx66 · 03-01-2010, 10:31 PM

they look pretty beasty, but from some of the pictures posted, it looks like two 350 together, explains the around 700 ci

MrBeast · 03-01-2010, 11:03 PM

Man one of those would be way cool in a mohagany boat.

MrBeast · 03-01-2010, 11:06 PM

Like the one in this video

http://www.youtube.com/watch?v=uwIGZLjugKA

Now if you had a matching 60's chevy 3/4 ton to pull said boat, that would be even cooler.

JEM · 03-02-2010, 12:40 AM

Quote:

Originally Posted by Justin36

It looks like two v-6's bolted together in the middle

It is two GMC V6s put together. One block, crank, cam, etc. but V6 heads, rods, etc.

Those V12s were probably the best-SOUNDING truck engine ever built.

I almost deluded myself into picking up an old Packard frame off eBay to build into a rod with one of these things in it, but common sense intervened.

I did some sketches and dimensions for an underslung frame for a Brooklands-style track roadster (google Napier-Railton) that'd be just about right for a 702, but that's going to wait until I find a first-rate aluminum panel beater who works for beer money (fat chance, that.)

78-5.3 · 03-02-2010, 09:37 AM

Quote:

Originally Posted by MrBeast

Like the one in this video http://www.youtube.com/watch?v=uwIGZLjugKA

Now if you had a matching 60's chevy 3/4 ton to pull said boat, that would be even cooler.

I NOTICED A 73-80 @ 3.21min

smashingchuck · 03-02-2010, 11:47 AM

A sure sign they aren't doing so well financially:

Reserve an engine for 2010 production for 25% down.

Reserve an engine for 2011 production for 10% down.

ghettoluxury · 03-02-2010, 12:05 PM

here is one in a bad a$$ hot rod COE

glock35ipsc · 03-02-2010, 01:58 PM

There use to be a few of those in the Wellington area that were used to power irrigating water pumps, and they ran 24/7. There were also some pumps that ran Hemis.... both 348's and 426's.

I would LOVE to build a hot rod around one of those engines!

sandblaster · 03-02-2010, 03:34 PM

might look kinda like this

YouTube- Balaur-1962 GMC 1 Ton v-12 702cid

kevinr1970 · 03-03-2010, 02:07 AM

I believe he is a member here and has a build thread for that.
I think his screen name is coyoterun?

*EDIT - yes it is here as posted by pyrotechnic above

Quote:

Originally Posted by sandblaster

might look kinda like this

YouTube- Balaur-1962 GMC 1 Ton v-12 702cid

03-01-2010, 03:31 PM	#1
chrismoore701 Registered User Join Date: Dec 2004 Location: Highland, IN Posts: 2,326	Gmc 702 c.i. V12 Thats right a GMC V12. Check out this link, they are bringing them back, not sure if they will fit in our trucks, but I bet some of you guys can make it fit. http://www.thunderv12.com/ __________________ Chris _______________________________ 1979 Chevy Stepside SPORT 2018 Chevy Silverado, 39 years apart My build 2008-2016. http://m.imgur.com/a/bURrE

03-01-2010, 04:17 PM	#2
68Timber I know the pieces fit Join Date: Nov 2007 Location: MONTGOMERY, AL Posts: 5,523	Re: Gmc 702 c.i. V12 2400 rpm peak power with the stock cam, closer to 3000 rpm peak power with their "HP" cam. Cool novelty item though. __________________ John 79 2wd Blazer (Bruiser) 85 M1009 Blazer (Sarge) build 74 Honda Z50 build

03-01-2010, 05:25 PM	#3
willett Another Day, Another Dollar Join Date: Nov 2008 Location: North Vancouver, BC Posts: 1,316	Re: Gmc 702 c.i. V12 http://thunderv12.com/power i dont know davey..... __________________ -78 K20 Cheyenne 454 long box, 4" lift, 35" MT's, '84 cab, '80 box "its hip to be square"

03-01-2010, 05:31 PM	#4
STOCKISH Formerly- 1972SuperCheyenne Join Date: Oct 2008 Location: Wake Forest NC Posts: 5,782	Re: Gmc 702 c.i. V12 Pretty cool looking. I'll stick to my 6.0 though. LS POWAAA __________________ --Josh My Build Thread:http://67-72chevytrucks.com/vboard/s...d.php?t=799218 A good crossthread is better than Loctite any day. Life is not about what you have, but who you have to share it with.

03-01-2010, 07:21 PM	#5
Pyrotechnic Registered User Join Date: Feb 2007 Location: Austin, TX Posts: 3,930	Re: Gmc 702 c.i. V12 http://67-72chevytrucks.com/vboard/s...d.php?t=254111 There's one in a truck. __________________ 1977 GMC Sierra Grande

03-01-2010, 08:42 PM	#6
C-10 simplex Account Suspended Join Date: Dec 2008 Location: indisclosed Posts: 1,515	Re: Gmc 702 c.i. V12 This is actually on my "to do" list. The way i would do it would be to move the cab back and shorten the bed; It actually looks pretty good in my mind and if i get around to it i'll make up a sketch and post it.

03-01-2010, 09:04 PM	#7
gchemist BAD BOW-Silverado XST Join Date: May 2000 Location: Senior Member from Austin, TX Posts: 6,431	Re: Gmc 702 c.i. V12 Fact: GM is now selling the latest in engineering technology, the LS9 supercharged V8 crate engine. It is a marvel. Yet with all the advancements and the addition of a supercharger, the advertised torque of 604lb-ft has not caught the 630 lb-ft that GMC advertised in 1960 for the stock 702 V12! And in our opinion, the looks of the V12 is still un-matchable. We have seen the LS9 for sale at $4,000 more than a ThunderV12. Wow! We are sure the LS9 is also a good looking engine, but until someone removes all the beauty covers and other "stuff" so we can see the actual motor, we won't know for sure. __________________ Gerardo a.k.a. Mad Chemist Silverado XST videos

03-01-2010, 10:09 PM	#8
Justin36 Registered User Join Date: Dec 2009 Location: Selmer, Tennessee Posts: 744	Re: Gmc 702 c.i. V12 It looks like two v-6's bolted together in the middle

03-01-2010, 10:31 PM	#9
dbmx66 Registered User Join Date: Aug 2009 Location: PA Posts: 883	Re: Gmc 702 c.i. V12 they look pretty beasty, but from some of the pictures posted, it looks like two 350 together, explains the around 700 ci

03-01-2010, 11:03 PM	#10
MrBeast high-Tech Red Neck Join Date: Feb 2008 Location: Livingston, MT/On my boat WA/BC/AK Posts: 2,294	Re: Gmc 702 c.i. V12 Man one of those would be way cool in a mohagany boat. __________________ "He used to be a pretty nice feller, now he's a welder!"

03-02-2010, 11:47 AM	#14
smashingchuck It'd be alot cooler if you did Join Date: May 2003 Location: Three Rivers, MI Posts: 2,345	Re: Gmc 702 c.i. V12 A sure sign they aren't doing so well financially: Reserve an engine for 2010 production for 25% down. Reserve an engine for 2011 production for 10% down. __________________ 78 Build Thread 4Runner Build

03-02-2010, 12:05 PM	#15
ghettoluxury Registered User Join Date: Apr 2009 Location: Waynesfield Ohio Posts: 1,991	Re: Gmc 702 c.i. V12 here is one in a bad a$$ hot rod COE __________________ 1949 Five Window, 1973 Step Side, 2000 Z71

03-02-2010, 01:58 PM	#16
glock35ipsc Next project: 1970 K10 Join Date: Feb 2004 Location: Fort Collins, Colo 80524 Posts: 6,684	Re: Gmc 702 c.i. V12 There use to be a few of those in the Wellington area that were used to power irrigating water pumps, and they ran 24/7. There were also some pumps that ran Hemis.... both 348's and 426's. I would LOVE to build a hot rod around one of those engines! __________________ *Bob* 1970 Chevy K10 LWB "Goldie" 350/TH350 *next project!!* 1981 Chevy C10 LWB 355/TH350 - My son's truck LS SWAP FORUM! Tons of LS swap info here! PLEASE CLICK HERE TO SUPPORT THE GREATEST BOARD ON THE NET! CLICK HERE FOR THE FAQ INDEX by KRUE Last edited by glock35ipsc; 03-02-2010 at 01:59 PM.

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