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Old 03-02-2012, 03:44 PM
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Pontiac engine in a GMC Truck

Does anyone now anything about the 1957 GMC trucks having Pontiac engines due to a fire at the assembly plant?

Thanks
jsl1978

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Old 03-02-2012, 03:56 PM
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GMC's of that era did get the Pontiac V8. I dont think Chevrolet trucks got V8's that early
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Old 03-02-2012, 03:57 PM
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nope..........
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Old 03-02-2012, 06:45 PM
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pontiac was a 347. 283 smallblock in 57 chevy trucks though.
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Old 03-02-2012, 06:49 PM
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GMC was using about anything they could get. Even nailhead Buicks in some truck models.
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Old 03-03-2012, 07:13 AM
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GMC used Pontiac's and Old's V-8's '55 thru '59 IIRC.... definitely OEM.

A GMC up to a 500 series would be a Pontiac engine. 550 and 600 had the 371 Olds from 57 to 59. 55,56 550 and 600 had the 324 Olds.

The 'fire' deal was over at the hydramatic plant in '53 (?)...
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Old 03-03-2012, 08:21 AM
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Yep, an old friend of mine had a '57 GMC with a 347" Poncho in it.
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Old 03-03-2012, 09:26 AM
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GMC was the "Pontiac of trucks" in that era. The Olds 371 was the "other" V8. They both used the legendary 4-speed "hydro" trans (I don't remember the correct name for the trans, but it's the one B&M became so famous for). When I was in high school, I chased a girl who's dad had bought a '59 new. NICE truck... 370, hydro, dealer-air, step side, lots of "chrome", a two-tone of a "blue-gray" color and white. It even had a "factory" sun visor.

There was a limited-use "326" in the early '60s trucks (really a 336 CID Pontiac). Rare and of little "concequence" except to those that might own one.

There was also the 305 and larger (up to 478) V6. We've built a couple of those. When looking at the chamber design, valve designs, cooling, etc., it's a "Pontiac" design. While not sharing any dimensions, it reflects a similar engineering approach.


FWIW

Jim
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Old 03-03-2012, 10:26 AM
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They ran the 322 Buick as well and it had nothing to do with a "fire" it was the bigger motor for the bigger trucks, because the Buick and Pontiac were better, more powerful motors.

Brian
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Old 03-04-2012, 11:41 AM
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Brian,

Didn't know about the Buick. Do you know what years?

I always heard "the fire" story was regarding the HydraMatic plant, not engines. I was told this is why "Jet-Away" and "Slim Jim" were used in Pontiacs AND Olds.

Jim
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Old 03-05-2012, 11:34 AM
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Quote:
Originally Posted by Mr. P-Body
Brian,

Didn't know about the Buick. Do you know what years?

I always heard "the fire" story was regarding the HydraMatic plant, not engines. I was told this is why "Jet-Away" and "Slim Jim" were used in Pontiacs AND Olds.

Jim
Response from a quick email to my brother the Nailhead Buick expert.

"They were used from 56-59 in 2.5 ton and larger trucks like GM Fire trucks. The 283 did not have enough balls.. I have all the engine mounting parts including the Hydro adapter but they mostly used hd 4 speed and 5 trans. There was very few parts that were exactly same as the Buick car used, cam,crank, pistons, rods, dampner, rocker arms and shafts and water manifolds, most other parts were redesigned for heavy duty truck use like block, heads, flywheel, valve covers, valley cover, timing chain(double roller), timing cover, water pump, pulleys, distributor etc.. The engine was called the TORQUE MASTER.. "

Brian
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Old 03-05-2012, 11:52 AM
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Thanks Brian. I like to learn "new stuff"... (:-

Jim
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Old 03-05-2012, 12:17 PM
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Quote:
Originally Posted by MARTINSR
They ran the 322 Buick as well and it had nothing to do with a "fire" it was the bigger motor for the bigger trucks, because the Buick and Pontiac were better, more powerful motors.

Brian
If the buick engine was used, did they use the Olds 4 speed Hydromatic with it ? If so why didn't they drop the buick dynaflow with the ever slipping bands ? The Nailhead was a great engine , but notorious for slipping. I know we had many trips to transmission shops to have the bands tightened. The Olds hydro was near bulletproof. We put a 394 olds and hydro in a 53 chev 1/2 ton. we figured it should have been a factory option. ~Bud
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Old 03-05-2012, 08:07 PM
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My brother says they used an adapter for the hydro.


Brian
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