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1953 261 block info?Update//
#1246192 Fri Dec 08 2017 08:15 PM
Joined: Aug 2017
Posts: 605
S
'Bolter
I found a local ad for a 261 block (just complete block no head) for sale. Did they make a 1953 full pressure 261? I'm waiting on cast engine number when he gets home. Also should it have the small "steam" hole sets, or did that depend on the head used on it? What else should I be looking or asking on it before I drive 2 hours to look at it. He said it has a set of Chevron stripes and is .40 over now. Going to replace my 1950 216 very cracked engine. Looking for a 235 but this just came on the radar. Any information on the 261 would be greatly appreciated. Under a few of the older forums I found a link but it shows 1954 261 and up cast info, NO 1953.
/// He said serial # is 1AO5I0533. Make any sense?
Ok. Sent me pictures: Date Code H203. Casting # 3701481.

Last edited by Shaffer's1950; Sat Dec 09 2017 03:10 AM.
Re: 1953 261 block?
Shaffer's1950 #1246193 Fri Dec 08 2017 08:23 PM
Joined: May 2006
Posts: 8,490
L
Master Gabster
No, there were no '53 261s. If it is indeed a '53 engine with captains bars (chevron stripes), it most likely is a 235 from a Powerglide equipped passenger car, as they also used those markings. A '53 Powerglide 235 will be a full pressure engine.


Bill Burmeister
Re: 1953 261 block?
Shaffer's1950 #1246194 Fri Dec 08 2017 08:27 PM
Joined: Aug 2017
Posts: 605
S
'Bolter
Ok, that's what research is saying. So I would have to Mic the cylinder Bore to confirm 235 unless he is off on the year. Also have to wait to get block cast #'s. Thanks.

Re: 1953 261 block?
Shaffer's1950 #1246196 Fri Dec 08 2017 08:33 PM
Joined: May 2006
Posts: 8,490
L
Master Gabster
You might see if he can get you the serial number stamped by distributor as well.


Bill Burmeister
Re: 1953 261 block?
Shaffer's1950 #1246197 Fri Dec 08 2017 08:55 PM
Joined: Sep 2011
Posts: 1,102
B
'Bolter
261 have another cast bar (1) on the L.H. side of the block near the head mounting surface near the center of the block. Also coolant passages (about 3/16" dia.) in block between cylinder 1-2, 3-4 & 5- 6. No 235 will have these coolant holes in block.


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: 1953 261 block?
Shaffer's1950 #1246199 Fri Dec 08 2017 09:44 PM
Joined: Jan 2000
Posts: 2,200
J
'Bolter
Sounds like a motor I have, picked it up thinking 261 per Captain's bars but it's a '53 235 PG motor, still a good find.
Best of luck


It's easier to get forgiveness than permission!
1946 1/2-Ton Chevy [stovebolt.com]
1953 Chevy 3/4-ton Factory Stakebed [stovebolt.com]
Re: 1953 261 block info?
Shaffer's1950 #1246211 Fri Dec 08 2017 11:56 PM
Joined: Sep 2001
Posts: 31,520
Bubba - Curmudgeon
They made high-pressure 235s in 1953 for Powerglide equipped cars/including Corvettes.

BC59's suggestion is the best in determining if you have a 261 (6 small holes as shown here). 261s supposedly did not become available until 1954 models.

Find and post all the casting codes: block casting code and block date casting code.


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]

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