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Australia 261 Chev identification help please
#1310340 Sat May 11 2019 09:51 AM
Joined: Jan 2010
Posts: 32
R
reidy Offline OP
Wrench Fetcher
I am after some information to see if the engine I picked up today is a 261 or a 235. I was told it came out of a 1958 Chev truck and I am in Australia.

I have looked for the casting number on the block. All that I can find is an “M” where the casting number should be just between the distributor and engine vent.
The engine number on the pad near the distributor is GR25052 which I can’t find any reference for.
The head casting number appears to be 3836850 which from what I can find is correct for a 1658 261 head.
I can also see two “Captains Bars” just above the starter motor.

Apart from pulling the head and measuring the bore is there any way to confirm it is a 261?
Can someone please decipher the GR in the engine number?
Is it possible the block was cast in Australia and the engine block casting number is in a totally different spot?

Thanks

Steve

Re: Australia 261 Chev identification help please
reidy #1310357 Sat May 11 2019 01:02 PM
Joined: Jan 2013
Posts: 1,662
S
Shop Shark
Very Odd,
Here are the marks on my 62 261.

Attached Files
IMG_1567.JPG (272.36 KB, 87 downloads)
IMG_1573.JPG (193.71 KB, 85 downloads)
IMG_1572.JPG (301.4 KB, 83 downloads)
Last edited by sstock; Sat May 11 2019 01:03 PM.

1953 Chevrolet 3100
261 cu inch, sm420, 3.55 rear, torque tube still,omaha orange, still 6 volt, RPO green glass, side carrier spare, all done
https://www.youtube.com/watch?v=Bli...n05i04t1aokgm4p04jiwgffwhyyih5xbk0h00410
1964 GMC 1000
305 Big Block V6, sm420, the next cab off restoration
Re: Australia 261 Chev identification help please
reidy #1310361 Sat May 11 2019 01:54 PM
Joined: Sep 2001
Posts: 30,487
ace skiver
Was the truck originally a USA truck, a Canadian truck, or a Holden (General Motors-Holden) truck?


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: Australia 261 Chev identification help please
reidy #1310362 Sat May 11 2019 02:06 PM
Joined: Nov 2005
Posts: 5,777
3
3B Online
Master Gabster
Hy reidy, a lot of Australian Chevrolets were made in Canada and shipped over, I have no idea when this practice ended, a lot of Canadian Chevrolet and GMC engines have serial numbers that begin with a G. I am surprised that you cannot find a casting number on the block they were in a few different places over the years, was the "M" you found surrounded by a circle? What size of truck is the engine from?

Re: Australia 261 Chev identification help please
reidy #1310363 Sat May 11 2019 02:06 PM
Joined: Feb 2004
Posts: 21,064
H
Boltergeist
Didn't someone identify that "M" in the circle as the identification mark of a foundry in Canada recently? How about the oil ports on the side of the block opposite the starter? If it's got two 1/2" pipe thread plugs there for full-flow filter plumbing it's definitely a 261, but I'm not sure if that began as early as 1958.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Australia 261 Chev identification help please
reidy #1310364 Sat May 11 2019 02:08 PM
Joined: Sep 2001
Posts: 30,487
ace skiver
Where is the "M" located on the block?

Is there a block casting code under/between the distributor and road draft tube?


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: Australia 261 Chev identification help please
tclederman #1310426 Sat May 11 2019 11:44 PM
Joined: Jan 2010
Posts: 32
R
reidy Offline OP
Wrench Fetcher
Thanks for all of the replies so far. The "M" has a square around it and is located approximately in the center of the triangle of bolt holes that I would assume would be for the engine mounts if this was fitted to a car. It is on the Distributor.

I am not sure what size truck this came out of but I was told by the seller the truck was used to pick up milk for the Warwick dairy so I would assume a full sized truck. The block does have the outlet/inlet for oil on the non starter side and there is a large canister mounted on the manifold. The oil lines are not complete.

From what I was told the truck was a right hand drive truck so I would assume it to be Australian delivered.

The Captains bars were enough for me take the risk buying this engine and it will probably be a couple of years before I will have a chance to rebuild and use it. I am mainly trying to confirm it is a 261 so I know I can stop looking for now.

I would still be interested what is the meaning of the "GR" on the engine serial number.

Thanks

Steve

Re: Australia 261 Chev identification help please
reidy #1310440 Sun May 12 2019 01:13 AM
Joined: Sep 2001
Posts: 30,487
ace skiver
"I am mainly trying to confirm it is a 261 so I know I can stop looking for now."

You have a 261.

In the USA, your codes were used on 261s in these years:
block casting code: 3769717 1958-1963 (and probably later on replacement engines)
head casting code: 3836850 1957-1963 (and probably later on replacement engines)


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]

Moderated by  Woogeroo 

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