The Stovebolt.com Forums Home | FAQ | Gallery | Tech Tips | Events | Features | Search
What's going on?
What's happening?

Find out in
THE SHOPS !

Genearl Truck Talk
20,267 threads; 177,521 posts
The Engine Shop
32,460 threads; 255,065 post
Driveline
8,796 threads; 65,970 posts
The Electrical Bay
9,505 threads; 74,285 posts
Sub: The Radio Bench
The HiPo Shop
5,040 threads; 46,029 posts
Paint & Body Shop
12,505 threads; 81,120 posts
Sub: The Doors
Interiors
4,059 threads; 26,817 posts
The Tool Chest
1,762 threads; 26,817 posts
Making a Stovebolt Bed
1,052 threads; 6,659 posts
Searching the Site

Get info about how to search the entire Stovebolt site here. To do a search for just the forums, get those details in the IT Shortbus fourm.
Old Truck Calendars
Months of truck photos!
Nothing like an old truck calendar

Stovebolt Calendars

Check for details!


Who's Online Now
13 members (79broncoowner, Hotrod Lincoln, 7045george, 32vsnake, 2 invisible), 106 guests, and 3 robots.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums59
Topics128,581
Posts1,041,650
Members46,050
Most Online1,229
Jan 21st, 2020
Step-by-step instructions for pictures in the forums
Previous Thread
Next Thread
Print Thread
Page 1 of 2 1 2
#1348241 Fri Feb 28 2020 07:46 PM
Joined: Oct 2019
Posts: 319
W
'Bolter
I was surfing around looking at various posts and saw a comment that the old GMC engines were better than the Chevy engines. Can someone pls. enlighten this newbie on this?

Thanks


Kevin
1965 Chevy C10 Longbed Fleetside
(Engine needed, originally 230)
WarEagle1 #1348243 Fri Feb 28 2020 08:11 PM
Joined: Apr 2005
Posts: 2,010
B
'Bolter
GMC used Pontiac engines

WarEagle1 #1348247 Fri Feb 28 2020 08:54 PM
Joined: Nov 2000
Posts: 2,081
F
'Bolter
When GMC introduced their own OHV 6-cylinder engine in (1939?) it had insert type rod bearings with oil pressure to the rods, while Chevy still had the babbitted rods and the dipper/ nozzle/ trough oiling of the rods. Some say everything about the GMC engines were built more heavy duty. They were “truck” engines.


Professional Novice
Builder #1348254 Fri Feb 28 2020 10:24 PM
Joined: Sep 2001
Posts: 31,613
Bubba - Curmudgeon
Originally Posted by Builder
GMC used Pontiac engines

What years and what engines?

Pontiac engines were available in GMC trucks from 1955 onwards (New Design GMC trucks)

older GMC engines (1955 Z-series and earlier) GMC trucks:
The GMC 228, 248, 279, 302 (6-cylinder engines, referred-to by Frasnk50, above) were not Pontiac engines.


Tim
1954Advance-Design.com [1954advance-design.com]
1954 3106 Carryall Suburban [stovebolt.com] - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic [1954advance-design.com] - part of the family for 15 years
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engines are not "splash oilers" - this is a splash oiler. [chevy.oldcarmanualproject.com]
WarEagle1 #1348255 Fri Feb 28 2020 10:48 PM
Joined: Jan 2013
Posts: 1,679
S
'Bolter
Pontiac engines were available in GMC trucks from 1955 onwards (New Design GMC trucks)

older GMC engines (1955 Z-series and earlier) GMC trucks:
GMC 228, 248, 279, 302 (6-cylinder engines) were not Pontiac engines.
[/quote]


And to add to that: in 1960 the standard engine in the pickups was the GMC 305 V6, this was not a pontiac engine, and believe from 1960 and up never another pontiac engine came down the line in a GMC, although later they offered chevrolet engines in GMCs

Last edited by sstock; Fri Feb 28 2020 10:50 PM.

1953 Chevrolet 3100
261 cu inch, sm420, 3.55 rear, torque tube still,omaha orange, still 6 volt, RPO green glass, side carrier spare, all done
https://www.youtube.com/watch?v=Bli...n05i04t1aokgm4p04jiwgffwhyyih5xbk0h00410
1964 GMC 1000
305 Big Block V6, sm420, the next cab off restoration
WarEagle1 #1348266 Sat Feb 29 2020 01:10 AM
Joined: Mar 2010
Posts: 10,155
5
'Bolter
And don't forget about the Buick Nailhead engines in some of the GMC big trucks from '57-'59.

WarEagle1 #1348277 Sat Feb 29 2020 02:18 AM
Joined: Nov 2011
Posts: 2,716
P
'Bolter
Originally Posted by WarEagle1
I was surfing around looking at various posts and saw a comment that the old GMC engines were better than the Chevy engines. Can someone pls. enlighten this newbie on this?

Thanks

I believe the assertion of "better" is from the pressurized oiling in earlier GMC's as Frank stated.

WarEagle1 #1348280 Sat Feb 29 2020 02:21 AM
Joined: Sep 2001
Posts: 31,613
Bubba - Curmudgeon
That would be “higher pressure” oil system in earlier GMC 6 cylinder engines?

Even low-pressure Chevrolet engines had/have pressurized oil lubrication systems.

I think I have heard/read that the GMC blocks and heads were harder (more zinc, maybe).
If so, they were harder metal.

It is late, and I have had a few wee drams. Forgive me.


Tim
1954Advance-Design.com [1954advance-design.com]
1954 3106 Carryall Suburban [stovebolt.com] - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic [1954advance-design.com] - part of the family for 15 years
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engines are not "splash oilers" - this is a splash oiler. [chevy.oldcarmanualproject.com]
WarEagle1 #1348281 Sat Feb 29 2020 02:34 AM
Joined: Feb 2004
Posts: 24,750
H
Kettle Custodian (pot stirrer)
GMC sixes were designed to be rebuilt multiple times. The pickup and midsize truck engines benefited from the same design features as the big rig engines- - - - -some of those engines even had cylinder assemblies that were separate from the crankcase, such as the 503 cubic inch inline six used in the mid-1950's heavy duty trucks. For instance, GMV 228-302 connecting rods have full-floating wrist pin bushings and lock rings in the pistons to retain the pins- - - -Chevy uses a clamp bolt in the rod to lock the pin to the rod. GMC oil pumps are huge compared to Chevy pumps, and the GMC runs approximately twice as much oil pressure. GMC has a much better cylinder head design- - - - -and the list goes on and on!
Jerry


"Freedom's just another word for nothing left to lose"
Kris Kristofferson

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!

There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self.
Ernest Hemingway

WAG MORE- - - - - -BARK LESS!
52Carl #1348283 Sat Feb 29 2020 03:18 AM
Joined: Mar 2004
Posts: 5,536
M
'Bolter
Originally Posted by 52Carl
And don't forget about the Buick Nailhead engines in some of the GMC big trucks from '57-'59.


Carl, Chevrolet used the Buick Nailhead (while they developed the 348), not GMC...

Mike B smile

Page 1 of 2 1 2

Moderated by  Phak1, Woogeroo 

Link Copied to Clipboard
Home | FAQ | Gallery | Tech Tips | Events | Features | Search | Hoo-Ya Shop
Powered by UBB.threads™ PHP Forum Software 7.7.5