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GMC 248 New Old stock
#1339507 Sun Dec 29 2019 01:43 AM
Joined: May 2012
Posts: 9
R
New Guy
Found in the woods at my friends house. Still in the crate (now completely rotted). Merry Christmas to me smile

Attached Files
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IMG_0204.JPG (228.31 KB, 376 downloads)
Re: GMC 248 New Old stock
Ronald '52 #1339523 Sun Dec 29 2019 03:16 AM
Joined: Dec 2003
Posts: 982
4
Shop Shark
What does look like under the valve cover? I would bet a critter found its way up the exhaust manifold. Mice seem to pick the most expensive places to build a house. Looks to be a recent deposit in the woods?

Re: GMC 248 New Old stock
Ronald '52 #1339524 Sun Dec 29 2019 03:41 AM
Joined: Jun 2001
Posts: 730
T
Bondo Artiste
Very cool! Military version.


Phillip
1927 Chevy Capital 1 Ton truck - basket case
1941 Chevy Suburban - Parts only
1949 GMC Suburban - 10 year project
1945 GMC half ton truck - Driver
1946 Chevy COE - Might restore one day...
1959 GMC Half ton long bed NAPCO

https://photos.google.com/u/1/albums
Re: GMC 248 New Old stock
Ronald '52 #1339538 Sun Dec 29 2019 11:57 AM
Joined: Dec 2010
Posts: 97
G
Shop Shark
I question the "New Old Stock". The black/silver tag on the left of the engine near the bellhousing looks like a rebuild tag to give bearing sizes. (Possibly fresh from a rebuild but probably not NOS. Remember the military's passion for "everything in its place". The crate might have been re-used for shipping/handling convenience.)

Re: GMC 248 New Old stock
Ronald '52 #1339853 Tue Dec 31 2019 03:29 PM
Joined: May 2012
Posts: 9
R
New Guy
Got it cleaned up a little. Yes, that is a rebuild tag.

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IMG_0206.JPG (429.78 KB, 244 downloads)
Re: GMC 248 New Old stock
Ronald '52 #1339903 Tue Dec 31 2019 10:28 PM
Joined: May 2006
Posts: 863
T
Shop Shark
What are your plans for this engine?

Last edited by tom moore; Tue Dec 31 2019 11:04 PM.
Re: GMC 248 New Old stock
Ronald '52 #1339913 Tue Dec 31 2019 11:54 PM
Joined: Jun 2011
Posts: 3,630
E
Shop Shark
If that is a military engine it might be a 270 or something else, what does the SN say?

Ed


'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
Re: GMC 248 New Old stock
tom moore #1339945 Wed Jan 01 2020 04:02 AM
Joined: May 2012
Posts: 9
R
New Guy
Not sure what my plans are yet. Maybe put it in my '52

Re: GMC 248 New Old stock
Ronald '52 #1339949 Wed Jan 01 2020 06:12 AM
Joined: Oct 2018
Posts: 67
C
Wrench Fetcher
Congrats... Awesome find!

Based on the condition of the cylinder head under the valve cover, it does not look like it has seen much use.

Would bet that engine is from/for a DUKW (aka "Duck") 2-1/2 ton amphibious truck.

Many features are consistent with that application:

Four blade fan with reverse pitch (DUKW pushes air through the radiator as opposed to pulling it).

Shallow oil pan. Engines with later features such as on this engine (6 valve fuel pump. cast iron carb., distributor shield) would have the deeper two piece oil pan if used in a conventional truck.

Also not sure, but I believe that the adapter bracket on the front damper is for the compressor in the tire inflation system.

Best Regards...

Re: GMC 248 New Old stock
Ronald '52 #1339950 Wed Jan 01 2020 06:17 AM
Joined: Oct 2018
Posts: 67
C
Wrench Fetcher
BTW, it is also most likely a 270, not a 248. A check of the number on the pad next to the distributor can confirm this.

Should start with 270-...

Best Regards...

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