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I was researching the difference. One important note and a critical point just for informations sake is that the oil filter on a 261 has to be open to oil flow. If the inlet/outlet ports on the engine are pluged off, IT WILL BLOW THE ENGINE. Alot of guys either want or don't want a oil filter on their 235. You can just plug up the ports if you don't want the filter. NOT SO with the 261. The 261 is a stronger built engine and alot of guys want to use it if possible. I didn't know this point about the 261.
Quote
Warning" When Installing a 261!
The stock remote filter system has two very visible 3/4" lines threaded into the block. One is from the pump to the filter and the other from the filter back to the block. Oil must leave and return to the engine by these lines (even if the filter is eliminated) or the engine will fail from lack of lubricant. Many 261 engines have been quickly seized after persons plugged the two oil line holes. They had many years experience on Chevrolet engines without the full flow oil system. Some thought it was an easy fix to just remove the 3/4" lines if one was leaking and cap the holes. This procedure was acceptable on the older 216 and 235 but never on the 1958-1962 261 truck engine.
Last edited by wawuzit; 08/20/12 10:38 PM.
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The 261 came out in trucks in 1954, these were the same as the 235 engines in many ways. The 58- 62 models were the ones with the full flow filters and they need to be open for circulation like the man said. The filter can be bypassed but do not just remove the lines and plug the ports.
Life's a long winding trail, love Jesus and ride a good horse!
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The 261 came in a few Canadian cars.In case any of our friends from Canada are listeninmg. 
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The 261 was not used in Canadian chevrolets but was used in the smaller Canadian Pontiacs begining in 1955.
Gene Schneider
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A Pontiac is a car...grin Sorry...I had to.
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Gene Schneider
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We had a 1960 Canadian Pontiac with a 261 when I was growing up. Sometimes when we were travelling in United States the gas station attendant would check the oil. They would usually be surprised by the "Chev engine" in a Pontiac!
My 1951 1 Ton is now on the road! My 38 Master 4 Door is also now on the road .
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Grease Monkey
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My neighbior has an old Power wagon and it has "Fargo" symbols on it rather than Dodge. Even most of the GM vehicle produced in the Canadian plants had differing names than we saw in the US. My neighbor has a '46 Ford F-1 with a Mercury nameplate on it and an entirely different grille. It is still stock too.
Normbc9
Last edited by Normbc9; 11/20/12 01:44 AM.
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I have a complete 261 engine. How can I tell it its the 54-57 or later one? Charlie 
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Good information. Thanks, Charlie
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