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GMC V6 and V12 Engines Engine repair and rebuilding

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  #31  
Old January 6th, 2017, 09:48 PM
POWERSTROKE POWERSTROKE is offline
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Default Re: Gmc V12 in trucks

Just shoot me a private message the day before or a couple hours before.

I REALLY like the looks of that L7000!. I'll bring my camera!
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  #32  
Old January 6th, 2017, 09:53 PM
bigblockv6 bigblockv6 is offline
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Default Re: Gmc V12 in trucks

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Originally Posted by bobdylan View Post
Yes, 7000 series trucks, minuteman missile transporter, fire trucks.
Just like to add it was B series conventional cabs and L series Tilt Cabs that had the 702 V12 that was available from 1960-65.
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  #33  
Old October 12th, 2018, 12:18 PM
POWERSTROKE POWERSTROKE is offline
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Default Re: Gmc V12 in trucks

Quote:
Originally Posted by Rap'em Pappy View Post
Powerstroke, I will contact you this summer. We can talk GMC's and maybe
I can convert you into owning one.
I don't know if Rap'em Pappy hangs out here anymore but I saw his V-12 pickup being hauled on County N around the I-94 traffic circles about 10:30 AM, Yesterday, Thursday, about 7 miles south of the east edge of SP. Have a lot more interest in the pickup now that I caught a glimpse of it. I'd still like to bobtail around in the tilt cab, hear that V-12 doing what it was built to do. My next door neighbor always has a semi-trailer or two sitting in his yard we could hook to to smooth the ride and make the tilt-cab bark a little.
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  #34  
Old October 13th, 2018, 06:31 PM
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LEWISMATKIN LEWISMATKIN is offline
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Default Re: Gmc V12 in trucks

As I was reading over the posts in this thread, I was reminded of a story my late father told about this engine. During the '60s, my family was the GMC dealer in Cullman, Alabama. Not only was the dealership a light/medium duty dealer, but the dealership was also a designated heavy duty repair station for both gas & diesel engines. In '62 or'63, dad was called out on a service call to repair a B7000-V12 truck at a local truck stop on north US 31(no interstate highways). This particular truck had tuning problems, being that previous mechanics had not properly tuned the engine. Dad re-tuned the engine, re-run the overhead, set the carburetors and timing, all the while being strung out underneath the cab of the truck. The owner said upon starting the engine after dad finished that was the best that engine had ever run. Dad said it took someone who had factory training (at that time) to properly tune these engines. BTW, my dad had over 30 certificates of training from GM Institute during the time we had GMC.
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  #35  
Old October 13th, 2018, 09:36 PM
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Cayoterun Cayoterun is offline
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Default Re: Gmc V12 in trucks

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Originally Posted by 1960gmcv12 View Post
I'm a newbie but did gmc actually put V12 in trucks I've never seen a pic of one in a truck
Howdy, and Welcome to the board!

A word of Warning! V-12s are addictive!

First, V12s are fast becoming extinct. Only built from 60-66. If a person can get one running regardless of use, you have a automotive living, breathing dinosaur. The engines were very durable, and I like the unique design. The "twin-six" came from the fact GMC used all components from the 351, hence, 702, Twin six on one block, crank, camshaft, ignition, and oil pan. All other parts are inter-changeable.

Many were used here in the plains states on Ag. irrigation wells. and burned natural gas. I worked for the farmer and cared for the motor that's in the '46 Chev. when it was new in '65. It pumped 2200 gal a minute for 22 years with one overhaul bored .30 over.

When we checked them at night, the exhaust manifolds would be glowing cherry red. If there was a weak cylinder, the manifold would have a darker spot at that one than the rest.

I keep it in our metal shop. When people come with smaller kids to see it, I'll start it up, let it warm a little, then gradually start speeding it up. When the metal on the shop starts to rumble about 2100, close the throttle real quick, and then back-fires, blowing fire out the 4 exhaust pipes, that's when the stampede starts for the door.

It doesn't take much to keep an ol' retired farmer entertained, Huh, Rap-em-Pappy?
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I think I'll fix it myself, and pay the extra $500.
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  #36  
Old October 14th, 2018, 02:47 AM
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Rap'em Pappy Rap'em Pappy is offline
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Default Re: Gmc V12 in trucks

Hi Coyoterun and powerstroke, Just give us old farm kids a wrench and
a old truck.....Just like a duck in water having fun. Yes, I took old Rap'em Pappy for a road trip to Lexington, Ky. There was a Goodguys show at of all places, Kentucky Horse Park. You might say I was just horsing around. This is a 1200 acre horse playground. With horses worth more than any vehicles there. With up 2000 vehicles there, NOT one other GMC V6, only my V12.
I always get asked about gas mileage. But I always tell them,,,about 25 to 30
thumbs up per gallon.
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  #37  
Old October 14th, 2018, 06:38 AM
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Default Re: Gmc V12 in trucks

Quote:
Originally Posted by Cayoterun View Post
When people come with smaller kids to see it, I'll start it up, let it warm a little, then gradually start speeding it up. When the metal on the shop starts to rumble about 2100, close the throttle real quick, and then back-fires, blowing fire out the 4 exhaust pipes, that's when the stampede starts for the door.
On my '62 6500 with the 478 V-6, once in a while when driving a hi-way speed of about 55 to 60 for a length of time and then coasting some slowing down for the exit ramp, it would let out a back fire equal to an M-80.

The first time it happened it sure scared the heck out of me.
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Drove and owned many, but some of the more interesting ones were:

-'60 GMC 2500 Dump, 305 V-6
-'62 GMC 4000 Flatbed, 305 V-6
-'62 GMC 6500 Flatbed Dump, 478 V-6
-'67 GMC 7500 Box, 6V-53 Detroit
-'71 GMC 9500 Flatbed Dump, 637 V-8
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  #38  
Old October 14th, 2018, 12:58 PM
POWERSTROKE POWERSTROKE is offline
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Default Re: Gmc V12 in trucks

Rap'em Pappy - Sounds like a FUN weekend. Pretty country around Lexington, Ky. My sister went to U of K there for a couple years. It's just crazy what horses are worth isn't it?
I hope you run into Dennis Gage sometime at a car show with Rap'em Pappy. I'd like to see him speechless on TV! He would be familiar with the stock truck.

SON went thru his mid-life crisis this summer. Traded his '14 Ram 2500 CTD off on a '18 Mustang GT with Performance Pkg #2, Recaro seats, Big Brembo brakes, Big sticky Pirelli tires, 305-40x19 I think. 460+ hp, 6 spd manual trans. All kinds of electronic stuff like Launch control, RPM matching for each shift, twin disk clutch. Anyhow, he still needs a truck. So I gave him my '96 F-250. He pulls his Mustang up to the gas pump a few people look but don't say anything. He pulls my old truck up to the pump and a crowd forms! It's kinda ticking him off! Just proves Trucks are COOL!
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  #39  
Old October 14th, 2018, 04:23 PM
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Cayoterun Cayoterun is offline
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Default Re: Gmc V12 in trucks

Quote:
Originally Posted by BillT View Post
On my '62 6500 with the 478 V-6, once in a while when driving a hi-way speed of about 55 to 60 for a length of time and then coasting some slowing down for the exit ramp, it would let out a back fire equal to an M-80.

The first time it happened it sure scared the heck out of me.
Thanks, BillT for a good belly-laugh to start the day. Did the floor boards shake, and you looked in the rear mirror to see how much pig iron was scattered on the pavement??

Since on wells, the motors ran a constant speed, we'd tune them at night and use the exhaust as a guide. With the stub pipes on each head, blue flame would be at the pipe tips, so we could tune each distributor on each side of the motor, by tuning in each distributor to max blue flame.
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I think I'll fix it myself, and pay the extra $500.
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  #40  
Old October 15th, 2018, 02:23 AM
BillT BillT is offline
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Default Re: Gmc V12 in trucks

Quote:
Originally Posted by Cayoterun View Post
Thanks, BillT for a good belly-laugh to start the day. Did the floor boards shake, and you looked in the rear mirror to see how much pig iron was scattered on the pavement??
Was looking in the mirrors for sure, lol.

I don't know why it didn't blow the Mufflers apart. Maybe because they were Straight-Thru Duals ??
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Drove and owned many, but some of the more interesting ones were:

-'60 GMC 2500 Dump, 305 V-6
-'62 GMC 4000 Flatbed, 305 V-6
-'62 GMC 6500 Flatbed Dump, 478 V-6
-'67 GMC 7500 Box, 6V-53 Detroit
-'71 GMC 9500 Flatbed Dump, 637 V-8
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