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  #16 (permalink)  
Old 03-14-2009, 05:18 AM
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A lot of interesting info.
I had a 63 GMC pickup, 305 V6, kick myself in the butt to this day for selling it.

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  #17 (permalink)  
Old 03-14-2009, 09:29 AM
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I don't know about GMC but as that Chevrolet bus chassis proves, they most certainly did use the Buick 322 from 55-59. My brother is a Buick Nailhead specialist and found this to be true while searching out parts for Buicks. The odd thing is, they revamped the motor quite a bit. He has matched up the part numbers between the "Chevy/Buick" 322 and the Buick 322 and found that there are MANY parts that don't have the same numbers and were "revamped" by Chevy. Most notably the Chevy/Buick has a twin roller timing chain! What is odd is that Buick had dropped the 322 in 56 but Chevy used it up until 59.

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  #18 (permalink)  
Old 03-14-2009, 12:49 PM
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Having grown up in Pontiac, Michigan in the 50's, I can tell you that Pontiac Motor plant was about two miles away from the GMC truck plant that built Chevy and GMC trucks. That could be a clue in regard to the 347 ending up in the GMC trucks. The 347 was also available in the Pontiac with tri-power.
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Old 03-14-2009, 12:53 PM
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I am quite familiar with the Buick/ Chev truck engine and they were offered in the larger Chev trucks, not only school buses. The Olds/GMC 371/370 was a very similar situation. The 370 GMC was the 1957 Olds version beefed up for truck use. Olds went on and changed the position of the main thrust bearing. I rediscovered this just last week when I was looking for a set of mains for a 370 GMC and 57 Only Olds mains are the same. Olds went on to the 394 which was 4.125 bore instead of the 4.0 of the 371. The 370 as well as inline 6 GMC line was dropped in 1960 for the V6. However the 270 inline 6 was produced through 62 for package delivery trucks. My theory is that they did not have time to redesign the dog house in the package delivery trucks to accommodate the wider V blocks.
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  #20 (permalink)  
Old 10-30-2009, 03:46 PM
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Interesting thread,did a Google search on '57 GMC V8 and wound up here.

My Dad had a '57 Panel in the late '60's with a Pontiac V8 and Hydramatic trans,wish I had it today.
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Old 11-14-2009, 06:53 AM
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What an interesting read. thanks for sharing
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Old 09-08-2010, 09:39 PM
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Originally Posted by mart
A lot of confusion and bit of misinformation here concerning mid 60's-early 60's GMC truck engines.

First GMC *never* used Olds or Buick engines in their trucks. The Buick rumour probably started because someone saw a listing in a parts catalog or somewhere concerning a 401 "GMC" engine and assumed that it since it was a"401, that it must be a similar displacement Buick 401 V8. Not so. A 401 GMC engine was just that - a "401 GMC" - and a V6 to boot!

Here's the real deal on the somewhat confusing GMC engine line from '55 through the mid 60's.

U.S built GMC's did use a version of the Pontiac V8 from '55 through '59. In 55 they used a 287 Pontiac, in '56- a 316, and '57- a 347. In '58 and '59 they used a 336 V8 that was a small bore (3 7/8) vesion of the Pontiac 370 V8. To muddy the waters a bit more, the GMC advertising guys gave the Pontiac engines one extra cube in the brochures in '55 and and '56. Hence the the "Pontiac" 287 was advertised as the "GMC 288" and the Pontiac 316 became the "GMC 317" engine. In these years too, if a 6 cylinder engine was used, the base engine was the 235 inline Chevy. A 261 6 banger that was a stroked Chevy 235 was also offered. In the U.S., GMC dropped the Pontiac engines after '59 and came out will their own, all new 60 degree V6 engine for 1960 - starting with a 305 V6. This engine was expanded over the years and depending on the model and gvw rating, became available in 305, 351, 401 and 478 inch sizes-all of them V6's! They even produced a massive 702 "twin six" V12 version for use in the GMC 'big trucks'.

Canadian built 6 cylinder '55 through '61 GMC's used the 235 and 261 versions of the Chevy 6. '55-59 Canadian built V8 GMC's never used the Pontiac engines. Instead, they came with 265 small block Chev V8's in '55, 56 and '57 (and into early '58) with the 283 Chev V8 becoming optional in '57 and the standard V8 in mid '58 through '67. In '62 the 327 and (1962-'65) 348-409 Chevy engines became extra cost options in various model Canadian GMC's. Beginning in '66, 396 and 366-427 Chevy big blocks were used as optional engines after the phase out of the 348-409 Chevies. Canadian built light duty trucks (under 10,000 GVW) never used the big U.S built V6's- they were simply rebadged Chevies and used the standard Chevy inline 6 or 283-327 small block (or 348-409 or 366-427 V8's in the heavy trucks), although the 401, 478 V6 and 702 V12 could be "special ordered "in the big (over 10,000 lb GVW) GMC trucks in Canada.

Hope this helps clear up some mysteries.

Sorry you are wrong. Olds engine was used in the bigger GMC. 2 1/2 TON trucks. The buick engine was used in the chevy big trucks The chevy 235 and 261 was never used in the US GMC trucks. They used there own 6 cyl. If you would like to see these come and see me. I can show you them, I have them all.
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Old 04-07-2012, 05:29 PM
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I have a 57 with a Pontiac 326 and A Hydro
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