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'56 GMC 1.5 ton - Engine ID and Firing Order
#1435113 Wed Dec 29 2021 09:00 PM
Joined: Dec 2021
Posts: 4
D
Moderated
Trying to start the engine on a '56 GMC 1.5 ton after who knows how long. I thought I had a 270 I-6, however after looking up the block casting numbers it appears I have a '53 or '54 248. So guessing it's not the original engine to this truck, which is kind of a bummer. Still hoping to get 'er started up. I have spark and now I have re-installed the carburetor with new gaskets. I installed new gaskets in the Carter Ball & Ball carburetor, which came from Chrysler (still leaking fuel from accelerator pump linkage - darn). The engine backfires through the carb, so now I want to verify the timing.

So here's me question: what is the firing order for this engine? Thinking it would be cast into the intake or somewhere else but couldn't locate it. Hoping someone reading this can also comment on the engine/truck relationship as well. Is there a chance this engine was original to the truck? Still not sure what to even call this old girl. '56 GMC 250? I was told by the previous owner it is for sure a 1.5 ton, so who knows. Starting to think that it's a bit of a "Frankenstein", but hard to imagine a guy would swap the 270 out for a 248 and then put a Chrysler carb on it. But maybe it's what he had laying around.

A quick response would be appreciated as I wanted to drive it to dinner tonight! Just kidding...

Attached Files
IMG_8992.JPG (340.46 KB, 154 downloads)
IMG_8991.JPG (255.74 KB, 152 downloads)
IMG_8989.JPG (269.06 KB, 153 downloads)
IMG_8990.JPG (131.86 KB, 152 downloads)

'56 GMC 1.5 Flatbed
Re: '56 GMC 1.5 ton - Engine ID and Firing Order
Derek S. #1435151 Thu Dec 30 2021 01:07 AM
Joined: Dec 2015
Posts: 2,289
Big Bolt Forum Moderator
250 is a one ton. Front wheels are a one ton bolt pattern, not 1 1/2 ton (can't see pattern on the rear)


Mike

1955 Chevy 6400 ex-flatbed (no bed now!)
In the Stovebolt Gallery [stovebolt.com]


1958 Chevy 6400 flatbed W/dump
In the Stovebolt Gallery [stovebolt.com]

1959 Chevy Suburban Owned for almost 20 years, Daily Driver -- sold May 2016
In the Stovebolt Gallery [stovebolt.com]

Sufficient unto the day is the evil thereof
Re: '56 GMC 1.5 ton - Engine ID and Firing Order
Derek S. #1435165 Thu Dec 30 2021 03:19 AM
Joined: Jun 2011
Posts: 4,452
E
'Bolter
Engine SN stamped on machined surface behind distributor on right side starts with displacement, I.e. 270xxxx, etc. Front wheel is 8 lug, so rear is probably same. Probably has SM-420 trans. If front hub is pipe thread that would fit for one ton. What is GVW? If engine is 248, it has been changed for sure. I have several 270 and 302 engines.

Ed

Last edited by EdPruss; Thu Dec 30 2021 03:21 AM.

'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: '56 GMC 1.5 ton - Engine ID and Firing Order
Derek S. #1435174 Thu Dec 30 2021 03:57 AM
Joined: Feb 2016
Posts: 133
D
'Bolter
Derek,

The block casting number in your third image (if I'm reading it right) "6107328" looks like it's a 1953-1955 248. This is from the Mark Allen casting numbers book.


-David

1953 2-Ton GMC

I'm a machinist... because engineers need heroes too.
Re: '56 GMC 1.5 ton - Engine ID and Firing Order
Derek S. #1435191 Thu Dec 30 2021 07:18 AM
Joined: Jan 2008
Posts: 4,799
C
'Bolter
The block casting is a '53-'54 248. The head casting should be 2194819, Normally the displacement of the engine would be the first 3 digits of the engine number. However this doesn't always hold true because it was common to change the engine number to match the title because many states titled vehicles by engine number until the mid 50's. There is nothing wrong with a 248 and this one has the later flat pistons and small combustion chamber head. However parts unique to the 248 such as pistons are getting hard to find.

Re: '56 GMC 1.5 ton - Engine ID and Firing Order
Derek S. #1435214 Thu Dec 30 2021 02:29 PM
Joined: Nov 2005
Posts: 6,056
3
3B Offline
'Bolter
Hy Derek S., welcome. the firing order for the 228 through 302 series engines is 153624, that is also true for the Chevrolet inline sixes as well, hope that helps.

Re: '56 GMC 1.5 ton - Engine ID and Firing Order
Derek S. #1435313 Fri Dec 31 2021 04:26 AM
Joined: Mar 2004
Posts: 5,426
M
'Bolter
The block date code in the third picture is B 10 4 (February 10, 1954).

Mike B smile

Re: '56 GMC 1.5 ton - Engine ID and Firing Order
3B #1435415 Fri Dec 31 2021 08:44 PM
Joined: Sep 2011
Posts: 1,102
B
'Bolter
Originally Posted by 3B
Hy Derek S., welcome. the firing order for the 228 through 302 series engines is 153624, that is also true for the Chevrolet inline sixes as well, hope that helps.

Old instructor at OIT taught 1st year students "easy way to remember in line 6 firing order, 15 is too young, 36 in to old & 24 is just right".


BC
1960 Chevy C10 driver 261 T5 3.73 dana 44
1949 GMC 250 project in waiting
1960 C60 pasture art
Retired GM dealer tech. 1980 - 2022
Re: '56 GMC 1.5 ton - Engine ID and Firing Order
Derek S. #1435452 Fri Dec 31 2021 10:15 PM
Joined: Feb 2004
Posts: 24,250
H
Kettle Custodian (pot stirrer)
The distributor rotor turns clockwise as you look down on it, so be sure you get the firing order right- - - -numerically and direction-wise. Pull the #1 spark plug out and "thumb" the hole for compression whlie someone else taps the starter, then put the #1 plug wire into the distributor cap wherever the rotor is pointing when the compression pops your thumb off the hole. Any cap tower can be #1. The engine doesn't care as long as the firing order is good and the ignition timing is set right.
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!

WAG MORE- - - - - -BARK LESS!
Re: '56 GMC 1.5 ton - Engine ID and Firing Order
Derek S. #1435530 Sat Jan 01 2022 04:17 PM
Joined: Jun 2011
Posts: 4,452
E
'Bolter
BC59,

Big Block 6 cyl GMC engines have different firing order.

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.
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