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| | | | Joined: May 2003 Posts: 1 Junior Member | | Junior Member Joined: May 2003 Posts: 1 | Can anyone confirm that the GMC
228,236,270 engine is based on
a Buick design? Also did the pre
39 GMC's (before the cab change)
trucks use a Buick engine?
Just curious. Thanks! | | | 
#9460 05/22/2003 10:26 PM | Joined: Jan 2000 Posts: 206 Member | | Member Joined: Jan 2000 Posts: 206 | My understanding is that the GMC L6 was a new-from-scratch design, but the engines were built in a former Buick plant. To my knowledge no parts will interchange. | | | | | Joined: Aug 2000 Posts: 523 Member | | Member Joined: Aug 2000 Posts: 523 | GMC's brfore and since have used car motors
1938 olds 1956 Pontiac I guess they thought if it was good enought for Chevy pickups to use car engines GMC drivers might not notice. | | | | | Joined: Aug 2001 Posts: 258 'Bolter | | 'Bolter Joined: Aug 2001 Posts: 258 | GG,
GMC did use Buick sixes, around 1929-1932 or so.
They also used a Pontiac flat-head six in the light & medium duty trucks of the mid-'30s.
In the '50s, they again used a Pontiac engine -this time a V-8.
I think the '37-'54 sixes were GMC designed and were their own animal; they had insert rod bearings, whereas Buicks kept their beloved poured babbit rods until then end of the straight-8: 1954!
In the late '20s, Buick had the biggest and best valve-in-head sixes of all the GM divisions, so that was probably why they turned there for a new "truck engine".
Will try to come up with more details and get back to you.
Frank McMullen
Frank McMullen
1941 Chevy dump truck
1949 GMC 100 pick-up
1954 Chevy 3600 pick-up
1955.1 4400 dump truck
1941 De Soto & other MoPars
1928 Model A F**D Special Coupe
| | | | | Joined: Nov 2000 Posts: 427 'Bolter | | 'Bolter Joined: Nov 2000 Posts: 427 | I have limited info on this topic, but my observations are:
1937 - Oldsmobile engine
1938 - Pontiac engine
1939 - 1966 - GMC engines with a smattering of Pontiac thrown in here and there for entertainment after '55. | | | | | Joined: Mar 2003 Posts: 313 'Bolter | | 'Bolter Joined: Mar 2003 Posts: 313 | The 1933 GMC used a Pontiac engine (200 cu.in.) for the first series and the second series used a "Buick type" engine (221 cu.in.). The 1934, 35 and 36 used a Oldsmobile engine (213 cu.in.). The 1937 used the Oldsmobile engine, but it was enlarged to 229 cu.in. The 1938 used the Pontiac engine, which was a 222 cu.in. In 1939, GMC went back to Oldsmobile engine. All engines listed above are for the light duty trucks, 1/2, 3/4 and some 1 ton trucks. This information is acording to "GMC, the first 100 years" by John Gunnell. | | |
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