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261
#1338909 Tue Dec 24 2019 01:10 AM
Joined: Oct 2019
Posts: 249
T
Tony292 Offline OP
Shop Shark
I bought a 261 and SM420 today. I’m trying to figure out what year the 261 is. The casting numbers are pictured below. Any help deciphering is greatly appreciated.

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CFBC895A-2EB1-41D4-A8AE-86D3E27EE108.jpeg (309.69 KB, 268 downloads)
A380B238-D7B7-42AB-9664-AF3046C07037.jpeg (223.25 KB, 262 downloads)
Re: 261
Tony292 #1338919 Tue Dec 24 2019 02:00 AM
Joined: Dec 2017
Posts: 796
D
Shop Shark
The head is a later 261, 56-62 head with an 86.2 cc combustion chamber. If you remove the valve cover, the casting date will be right there and you can pin it down even further.


Mike
Re: 261
Tony292 #1338921 Tue Dec 24 2019 02:52 AM
Joined: Feb 2001
Posts: 1,340
T
Shop Shark
3759365 is a 1959 block.


Tommy
59 apache 1/2t
261 short stepside
Re: 261
Tony292 #1338951 Tue Dec 24 2019 12:55 PM
Joined: Nov 1995
Posts: 4,612
J
Unrepentant VW Lover
If you show us the other casting numbers on the block (below and aft of the distributor pad), we can tell you the exact year and month the block was cast. Here's an example

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a a-ID-3.jpg (17.06 KB, 216 downloads)

John
"There is a life about to start
When tomorrow comes..."


'49 Chevrolet 3804

Re: 261
Tony292 #1338957 Tue Dec 24 2019 02:06 PM
Joined: Sep 2001
Posts: 30,330
ace skiver


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: 261
John Milliman #1338995 Tue Dec 24 2019 05:51 PM
Joined: Oct 2019
Posts: 249
T
Tony292 Offline OP
Shop Shark
I’ll have to remove the starter to see that number there’s a lot of crud in that area.

Re: 261
Tony292 #1339036 Tue Dec 24 2019 09:14 PM
Joined: Oct 2019
Posts: 249
T
Tony292 Offline OP
Shop Shark
Did some more scraping and found k68 at the starter, is this November 6, 1958?

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B53E976F-9CEF-4AA0-A161-F50AF163CB92.jpeg (380.69 KB, 174 downloads)
Re: 261
Tony292 #1339038 Tue Dec 24 2019 09:28 PM
Joined: Sep 2001
Posts: 30,330
ace skiver
Yes, I think.
Wait to hear from others.


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: 261
Tony292 #1339084 Wed Dec 25 2019 04:56 AM
Joined: Dec 2017
Posts: 796
D
Shop Shark
I forget now if they skipped the letter “I”. If so then it would be October 58. Either way it’s a block for the 59 model year.


Mike
Re: 261
Dragsix #1339162 Thu Dec 26 2019 01:47 AM
Joined: Mar 2004
Posts: 4,607
M
Shop Shark
Originally Posted by Dragsix
I forget now if they skipped the letter “I”. If so then it would be October 58. Either way it’s a block for the 59 model year.


Good question, I know they used "I" (eye) on the chassis serial numbers for September, I can't confirm if they used "I" on the engine casting date codes... but something in my old memory is saying they didnt...

Mike B smile

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