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GMC Truck Engine

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37 chief

12-31-2005 23:20:58




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I ran across this old GMC dump truck in a field where I did some discing. I have no idea what the year I would guess late 60's middle 70's. It has a rather large looking 6 cylinder motor. I was woundering what size this motor is, and if it will fit my 54 Chevy 1 1/2 ton. I can have the motor, and trans if I want it. Thanks for any info. Stan




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BLW

01-03-2006 08:25:50




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 Re: GMC Truck Engine in reply to 37 chief, 12-31-2005 23:20:58  
if it is in a PU or not to large a 6 wheeler it is probably a 292 good motor if it is a 292 it would have a blue color esp. the valve cover scrape some of the gunk off and hopefully you will still have some color-- other wise look for the serial or casting # and find some one with a book on this



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DaveInMI

01-01-2006 15:20:17




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 Re: GMC Truck Engine in reply to 37 chief, 12-31-2005 23:20:58  
I had a 261 cu.in. inline 6 in 58 chevrolet pickup. The engine came out of my dad's 1960 grain truck that he put a 348 cu.in. auto engine in. When I was in high school, a guy had a 53 chevie 2-door that he claimed had a GMC 270 cu.in. inline 6. It would stay with a not too modified 283 V-8.



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J. Schwiebert

01-01-2006 12:09:01




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 Re: GMC Truck Engine in reply to 37 chief, 12-31-2005 23:20:58  
How about a casting number for the block or head?



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JDknut

01-01-2006 10:32:40




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 Re: GMC Truck Engine in reply to 37 chief, 12-31-2005 23:20:58  
If you could pinpoint it with a series designation, we could tell you exactly what it is. 6-cylinder medium-duty (I assume that is the size range of the truck) GMC truck engines of that late 60's to mid '70's era cover a wide range as that time frame spans the change over from the unique to GMC V-6 to the same engines that Chevy used. It could be a V-6 of 305, 351, 401, or 478 cubic inches depending on the size of the truck. The inline sixes would be the 250 (not too likely in a medium duty truck as it is so small) or 292. By the mid 70's, GMC was using the same engines as Chevy in their mediums: 292 (6), and V-8's 350, 366, 427 CID. Before 1960, when GMC went to the V-6, there were a plethora of inline sixes with rounded valve covers: 228, 248, 270, 302, 360, 426, and 503 cubic inches. The 302 was used widely in Army trucks.

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E.Borchardt

01-01-2006 09:26:32




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 Re: GMC Truck Engine in reply to 37 chief, 12-31-2005 23:20:58  
Gents, GMC also had a 426 cu. in. Stright 6 in the 50's
Earl in KY



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old

01-01-2006 09:14:23




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 Re: GMC Truck Engine in reply to 37 chief, 12-31-2005 23:20:58  
Stright 6 or V-6 if stright it could be a 250 or 292, if V 6 it could be a 305 or something like that. They use a bigger bellhouseing then most GM engines. I have 2 or 3 of those engines my self out here on the farm.



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Mark - IN.

01-01-2006 07:54:42




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 Re: GMC Truck Engine in reply to 37 chief, 12-31-2005 23:20:58  
Stan, not sure about the bell housing in your 1.5 ton. I see where many here say it's a 292, and it probably is if it's an I6. But you didn't say if it's an I6 or a V6. GMC used a pretty good sized V6 back in that era, the 305.

I'd kind of like to say that the bell housings would be interchangeable between those 2 sixs, but did that bellhousing date back to your truck? Can't help there.

Good luck, use it in good health, and Happy New Year to you, yours, and all.

Mark

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37 chief

01-01-2006 08:54:05




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 Re: GMC Truck Engine in reply to Mark - IN., 01-01-2006 07:54:42  
I guess I should have mentioned it is straight 6. What caught my attention is the rounded valve cover. Stan



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Vern

01-01-2006 21:02:37




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 Re: GMC Truck Engine in reply to 37 chief, 01-01-2006 08:54:05  
It might be a 270 cu in. These were hop-up replacements in the 40's & 50'chevys. I have one in a 6400 series '49 chev dump truck. Had to move the radiator forward tho.

Vern



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37 chief

01-02-2006 09:54:04




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 Re: GMC Truck Engine in reply to Vern, 01-01-2006 21:02:37  
My 54 is also a 6400 series. Stan



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old

01-01-2006 09:16:20




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 Re: GMC Truck Engine in reply to 37 chief, 01-01-2006 08:54:05  
Thats would make it the 292, Most parts from the 250 will work on the 292. I also have 3-5 of them laying around on the place



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Bus Driver

01-01-2006 06:32:09




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 Re: GMC Truck Engine in reply to 37 chief, 12-31-2005 23:20:58  
By 1965 and since then, perhaps a few years earlier, the GMC and Chevrolet trucks used the same engines for inline 6's and V-8's. In the 1940's and at least part of the 1950's, the GMC had a different engine. The first GMC V-8 in 1955 was really a Pontiac engine. The GMC 6 of the early 50's was quite adaptable to "hop up" procedures and was even used in Indianapolis race cars. Wayne Hornung made speed parts for that engine.

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Fern(Mi)

01-01-2006 06:11:15




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 Re: GMC Truck Engine in reply to 37 chief, 12-31-2005 23:20:58  
Tooooo many wrongs here don’t make a right. The following is as I remember it!!!!
54 GMC's used a Buick 6 cyl. engine what was slightly longer (1 ½”) than the Chevy 6 cyl counterpart. Also the GMC's at that time had a pedal start near the accelerator. That pedal bell-cranked on a horizontal shaft adjacent to bolted together engine and block. The Bell housing is definitely different. Even starting in 1956 bell housing were many many-different bell design patterns across the GM lines, each division manufacturing there own engines. The 1954 GMC engine’s motor mount was straight out in front of the engine block. The dump truck engine’s motor mounts are mountings are either side the engine. With a few parts swapped and some welding You should be able to fit it all together. Sounds like a good time to me.
Good Luck Fernan

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DJM75

01-01-2006 04:32:25




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 Re: GMC Truck Engine in reply to 37 chief, 12-31-2005 23:20:58  
rick is right all chev,gmc,and cadillac bellhousing are the same don't matter if its a 6 or 8 or v or straight but buick pontiac and oldsmoblie were different. It's probably a 292.



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doogdoog

01-01-2006 03:20:58




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 Re: GMC Truck Engine in reply to 37 chief, 12-31-2005 23:20:58  
Aloha, If it is a 292ci, your truck will hop skip and jump! Remember that chev had a 283 and that was a v8 and this is a 6cyl.

Mahalo,
doogdoog



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rick in sc

01-01-2006 03:06:27




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 Re: GMC Truck Engine in reply to 37 chief, 12-31-2005 23:20:58  
If the engine in an inline 6, it"s most likely a 292 Chev. and I think it is an easy swap into your "54 but check the way the front of the engine mounts.Bellhousing bolt pattern is the same on Chev. from the 1930"s until the Gen II engines came out in the late 1990"s



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cannonball

01-01-2006 03:59:39




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 Re: GMC Truck Engine in reply to rick in sc, 01-01-2006 03:06:27  
on that chevy that bell housing would have to be changed, if gmc is newer than 1964 if not might work..all chevys from 1964 on you could bolt up 6 or 8...don't know if the gmc was inline 6 or v, but gmc made 2 v6 engines that were tough...one was a 305 and don't remember the other....have nice day may god bless



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Johnski

12-31-2005 23:38:56




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 Re: GMC Truck Engine in reply to 37 chief, 12-31-2005 23:20:58  
I believe that motor is around 350 c.i.(351 seems to ring a bell). I had one in an old C-50 flatbed. Those are slow turning motors and have a lot of torque but they had skinny bearings and cannot stand up to a lot of rpms. If your gearing is correct it should work out. HTH Jf



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Johnski

01-01-2006 07:57:39




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 Re: GMC Truck Engine in reply to Johnski, 12-31-2005 23:38:56  
The engine I was referring to was a V-6 and strictly used in GMC,s. I think the truck I had was a 64 or 65. ;>) Jf



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DJM75

01-01-2006 04:29:58




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 Re: GMC Truck Engine in reply to Johnski, 12-31-2005 23:38:56  
It was a 348 tall deck it was made only for the large trucks and slow turning there was also a 366.



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