Labor Day Putting down your wrenches or time for
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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Nov 2010 Posts: 62 'Bolter | | 'Bolter Joined: Nov 2010 Posts: 62 | I am going to look at a 46 GMC dump truck and was wondering what size of motor they came with?
Thanks | | | | | Joined: Nov 2005 Posts: 6,100 'Bolter | | 'Bolter Joined: Nov 2005 Posts: 6,100 | Hy Buckstruck, It could come with many different engines depending on just what size of truck it is. GMC built trucks far in excess of the capacity of their Chevrolet cousins. If the truck is comparable in size to a Chevrolet, then it would probably have a 248 or 270 GMC engine, hope that helps. | | | | | Joined: Jul 2008 Posts: 413 Shop Shark | | Shop Shark Joined: Jul 2008 Posts: 413 | Remember to look at the flat pad at the base of the distributor, the first 3 didgits on that pad are the engine size. | | | | | Joined: Nov 2010 Posts: 62 'Bolter | | 'Bolter Joined: Nov 2010 Posts: 62 | | | | | | Joined: Mar 2011 Posts: 667 Shop Shark | | Shop Shark Joined: Mar 2011 Posts: 667 | According to the factory book for '46, standard issue for engines was as follows for each series...
3000 thru 4000 : 216.5 THRIFT-MASTER (90HP @ 3100 RPM - Torque= 174@1200-2000 rpm)
5000: 235.5 LOAD-MASTER (90 hp @ 3100 rpm - Torque= 189 @ 1000-1900 rpm)
6000: 235.5 LOAD-MASTER (93 hp @ 3100 rpm - Torque= 192 @ 1000-1900 rpm)
Obviously the bigger trucks had bigger engines but the 6000's must have been "tweaked" just a tiny bit. Note that all the above are "gross" ratings. | | | | | Joined: Dec 2002 Posts: 2,548 'Bolter | | 'Bolter Joined: Dec 2002 Posts: 2,548 | | | | | | Joined: Mar 2011 Posts: 667 Shop Shark | | Shop Shark Joined: Mar 2011 Posts: 667 | Thanks Spanky --- that's what I get for tryin to read writin when it's wrote.
The numbers posted are indeed for Chevy's. No ideer what the Jimmy's might be. | | | | | Joined: Mar 2012 Posts: 211 'Bolter | | 'Bolter Joined: Mar 2012 Posts: 211 | | | | | | Joined: Jan 2008 Posts: 4,959 'Bolter | | 'Bolter Joined: Jan 2008 Posts: 4,959 | A 46 300 series would have probably had a 236 in it. A little larger truck would have a 248 in it. But you never know what someone may have installed in it during the past 70 years. A 228, 236 and 248 are totally interchangeable. | | | | | Joined: Jun 2011 Posts: 5,096 Crusing in the Passing Lane | | Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | It could also be a 'big block' 6; 427, 503?
'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.
| | | | | Joined: Jun 2011 Posts: 1,901 Shop Shark | | Shop Shark Joined: Jun 2011 Posts: 1,901 | unfortunately the 55-59 GMC manual isn't going to help with specifics but it might give some clues as to how GMC did things... 55-59 GMC data page from OCMP
Give me ambiguity
or give me something else
| | | | | Joined: Apr 2001 Posts: 268 Shop Shark | | Shop Shark Joined: Apr 2001 Posts: 268 | If it is a 300 series it probably will be a 228 CID. Else it is a GMC 216 (not Chevy 216).
I just bought a 1949 GMC 350(2 ton)flat bed with dump hoist. It is all original from Southern Pacific Railroad. It has a 228 CID in it. I checked the numbers on the block...
If the truck was built in Canada it could have a Chevy 216 in it.
Need to see picture of engine.
As suggested above check numbers on block that will end any confusion.
GMCPic
Dance like no one is watching,
Sing like no one is listening,
Love like you've never been hurt.
1948 GMC FC101 1/2t Pickup w/270 and SM420
1948 GMC FC253 1t Factory 80"x9' Flatbed Dually
1948 Chevy COE 2 Ton 8'x15' Flatbed
1950 GMC 354-24 2 Ton 8'X12' Flatbed w/Dump Hoist
1953 GMC 454-30 3 Ton 8'x14' Flatbed w/Dump Hoist
1953 GMC 454-30 3 Ton Cab and Chassis
1942 Clarkator 6 MILL-44 Heavy Aircraft Tug
1942 Ford (9N) Moto Tug with 1/2 yard Loader
1947 Oliver OC3 HG-42 Tract-Crawler Bull Dozier w/6' Blade
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