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Mystery engine
#1402541 Mon Mar 22 2021 06:50 PM
Joined: Dec 2020
Posts: 101
5
53&Me Offline OP
'Bolter
Hey all, I just picked up a 51' GMC 250 dumptruck that has an inline 6 with a chevrolet valvecover on it. I've tried looking up the number on the engine located by the dizy. F0222LB....if somene could please send a link to the engine #decifer information that would be super helpful.

Re: Mystery engine
53&Me #1402550 Mon Mar 22 2021 07:54 PM
Joined: Sep 2001
Posts: 31,202
Bubba
My guess would be 1953 3100 216 engine. [1954advance-design.com]

Find and post the following:
- block casting code
- block date casting code
- head casting code
- head date casting code
- the complete Engine Serial Number


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]
Re: Mystery engine
53&Me #1402561 Mon Mar 22 2021 10:10 PM
Joined: Aug 2018
Posts: 355
D
'Bolter
That looks like the later style engine number that started in '57 and ran through '62. If that's right, the F indicates Flint, MI manufacturing plant. 02 is the month - February. 22 is the day of the month. And LB is the service code.

LB was first used in '57, but for the 265 V8 - not correct. In '58, Chevy changed the service codes. L indicated 6000 series truck, and inline 261 engine. No LB code. In '59, L still indicates 6000 series truck with 261, but jumps to LC (no LB code), also a 261. Then in '60, the LB code shows up again, for 60-series trucks as the base engine, which would be the 261. Best guess is that the engine is a '60-'63 HD truck 261.

Here's the '60 VIK from the GM Heritage Center. Look to page #7 (8th page of the .pdf) for the service code shown in the attached image: 1960-Chevrolet-Truck.pdf [gmheritagecenter.com]

Confirming that ID, and narrowing the model year can be done with what Tim posted: casting numbers and dates.

Doug

Attached Files
Capture2.JPG (189.79 KB, 225 downloads)
Re: Mystery engine
53&Me #1402565 Mon Mar 22 2021 10:39 PM
Joined: Sep 2001
Posts: 31,202
Bubba
If it is a 54-63 CHevrolet truck engine, here are locations of various "ID" codes. [1954advance-design.com]


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]
Re: Mystery engine
53&Me #1402582 Tue Mar 23 2021 12:44 AM
Joined: Dec 2020
Posts: 101
5
53&Me Offline OP
'Bolter
Thank you Tim and Doug, much appreciated. I'll start scrapping the crud off in a couple places. 😉👍

Last edited by 53&Me; Tue Mar 23 2021 12:44 AM.
Re: Mystery engine
53&Me #1402622 Tue Mar 23 2021 01:39 PM
Joined: Dec 2020
Posts: 101
5
53&Me Offline OP
'Bolter
ok, odly enough my head and block numbers are the same: head# 3836850 block#3769717

Re: Mystery engine
53&Me #1402625 Tue Mar 23 2021 01:45 PM
Joined: Dec 2020
Posts: 101
5
53&Me Offline OP
'Bolter
I will be excavating the other numbers soon.

Re: Mystery engine
53&Me #1402636 Tue Mar 23 2021 03:25 PM
Joined: Aug 2018
Posts: 355
D
'Bolter
'53, The block casting number confirms it's a 261. That casting was first used in '58, and continued throughout the following production years, into early '63. That head is also the factory casting used on 261s.

From Tim's info, you'll see that the block date code is cast just behind, and slightly above the starter. You should see a letter-number sequence that will start with something like CON4 - ignore that, it's just the conveyor used in the manufacturing plant - followed by a letter-number sequence that decodes to the casting date. To see the date code on the head casting, the valve cover needs to come off. It will be driver's side, just a little aft of the carb.

In any event, great engine. If you are rebuilding, check thoroughly/magnaflux for cracks in both head and block castings. Trucks used hard were somewhat prone to developing thermal-stress cracks.

Doug

Re: Mystery engine
53&Me #1402953 Thu Mar 25 2021 01:05 PM
Joined: Dec 2020
Posts: 101
5
53&Me Offline OP
'Bolter
I removed the valve cover and found casting number B152, I'll try to get the block number in the next day or two.

Last edited by 53&Me; Thu Mar 25 2021 01:08 PM.
Re: Mystery engine
53&Me #1402976 Thu Mar 25 2021 04:43 PM
Joined: Dec 2020
Posts: 101
5
53&Me Offline OP
'Bolter
So from what I can tell, the head is dated: February 15 1962

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