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Jul 21st, 2025 | | | | Joined: Mar 2004 Posts: 6,189 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 6,189 | The 5/8" inch depth info can be found in any late 50's early 60's Parts Book under the "Installation Instructions" section which is found on about page 100 (after the illustrations). Hope this helps, Mike B  | | | | | Joined: Dec 2000 Posts: 3,399 Gas Pumper | | Gas Pumper Joined: Dec 2000 Posts: 3,399 | I am late 50's parts book poor at the moment. Anyone having the actual text in front of them, please snap me off a picture or reference the Title of the book, and exact page number. When documenting, you want the reader to be able to see for themselves. Especially interested in the one that says 5/8" (.63). Thanks! | | | | | Joined: Jan 2001 Posts: 1,410 ODSS President | | ODSS President Joined: Jan 2001 Posts: 1,410 | Well, my 261 plug went in ~ .725, went in easy as I remember.
~ Cosmo
1949 Chevy Half Ton
Rocinante, like Don Quixote, he is awkward, past his prime, and engaged in a task beyond his capacities.
"...my good horse Rocinante, mine eternal and inseparable companion in all my journeys and courses." ...Don Quixote, Cervantes
"If you come to a fork in the road, take it."...Yogi Berra
"Rudeness is the weak man's imitation of strength." ...Eric Hoffer
| | | | | Joined: Feb 2004 Posts: 28,674 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 28,674 | Good grief- - - -will somebody wet-nurse Deve through his latest crisis? He's about to drown in a sea of tears! The simple thing to do would be to take the plug out and measure the depth of the hole!  Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Dec 2000 Posts: 3,399 Gas Pumper | | Gas Pumper Joined: Dec 2000 Posts: 3,399 | So, to get the plug out I can either take the oil pan off, or drill and tap the plug so I can get a slide hammer on it. SO YEAH please DO wet nurse me thru it! Not real excited about either of those two options. So, I'm first gonna try using an oak dowel and a hammer and see how much resistance I get. I am holding off on that until all the wet nurses here are done commenting. Interesting new fact: You can't get to that plug by taking off the oil pan. Its in a blind hole. Glad I waited. | | | | | Joined: Feb 2004 Posts: 28,674 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 28,674 | Don't bother pulling the pan- - - -the plug goes into a blind hole. Its only function is to stop the oil pump output from getting to the main oil gallery, and diverting it to the filter first. Heat the block before you try to drive the plug in- - - -it's a TIGHT fit.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: May 2005 Posts: 8,877 . | | . Joined: May 2005 Posts: 8,877 | The plug must be about or over 5/8" long is my guess.
So drill and tap 3/8" and use a slide hammer, no chips in the oil if you don't drill through it.
Grigg
Last edited by Woogeroo; 03/02/2015 1:16 AM.
| | | | | Joined: Dec 2000 Posts: 3,399 Gas Pumper | | Gas Pumper Joined: Dec 2000 Posts: 3,399 | So the way Deve works is, I get as many opinions on what to do as I can find. In this case, Dave and Cosmo thought that pin would just drive right in. Jerry and another fellow from Inliners said there is a very good chance of breaking the engine block. Grigg felt taking it out made the most sense. After sitting on the idea for a few days, Jerry sways it a bit by saying drive it in, but use Heat because its very tight. With the odds now favoring drive it in, I got out the heat, heated the area up, and drove it in! It's exactly 5/8" in too! No broken engine block, no drilling, but it was VERY VERY TIGHT. I used a long drift punch and a big ball peen hammer after heating. Which is good because at 30psi we don't need leakage. Before: http://devestechnet.com/Images/Restorations/1950B/D50b00479lg.jpgAfter: http://devestechnet.com/Images/Restorations/1950B/D50b00489lg.jpgThanks again. All of this and much more is going into a nice later model 261 How-To so others can benefit. All that's left now is those references Tim has offered and the references to the plug depth. No tears today! | | | | | Joined: Jan 2001 Posts: 5,320 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,320 | I did find info direct from a Chevrolet short block installation instructions that covers the pin location. LINK. It is at the very bottom of page.
See the USA in your vintage Chevrolet! My Blog | | | | | Joined: Dec 2000 Posts: 3,399 Gas Pumper | | Gas Pumper Joined: Dec 2000 Posts: 3,399 | Thats good Dave thanks once again! But if anyone out there has an actual manual from Chevrolet stating this, please get it to me for reference inclusion in the article. Great confirmation! | | | | | Joined: Sep 2001 Posts: 29,262 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,262 | Thanks, Dave
Last edited by Woogeroo; 03/02/2015 1:19 AM.
| | | | | Joined: Mar 2004 Posts: 6,189 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 6,189 | Deve, I sent you an email with the Chevrolet info you wanted...Please link it here for others to see. Thanks, Mike B
Last edited by Woogeroo; 03/02/2015 1:19 AM.
| | | | | Joined: Dec 2000 Posts: 3,399 Gas Pumper | | Gas Pumper Joined: Dec 2000 Posts: 3,399 |
Last edited by Woogeroo; 03/02/2015 1:19 AM.
| | | | | Joined: Mar 2010 Posts: 10,059 Renaissance Man | | Renaissance Man Joined: Mar 2010 Posts: 10,059 | Deve, have you primed and painted that bare metal now exposed from pushing that plug in? I jest only because I care. Seriously I do like the way you have employed new tech while retaining much in the way of original appearance. Carl
Last edited by Woogeroo; 03/02/2015 1:19 AM.
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission
| | | | | Joined: Dec 2000 Posts: 3,399 Gas Pumper | | Gas Pumper Joined: Dec 2000 Posts: 3,399 | Yeah, I am just so relieved I didn't break something, I havent had time to think about cleaning it up yet! That was worth a few extra beers! Thanks Carl! 
Last edited by Woogeroo; 03/02/2015 1:19 AM.
| | | | | Joined: Feb 2002 Posts: 2,877 Socket Breaker | | Socket Breaker Joined: Feb 2002 Posts: 2,877 | engine shop / 261 engine oiling system / formerly united engine of kansas / extracted to new thread... ---- This was the first post - the other posts above were moved and merged to this one. Since they are older, they are up top... however, when you click on the topic thread subject from within the engine shop list, you come to this post in the thread first. Below is the link straight to the 1st post in this thread. 1st post ---- New end of thread. Please continue the 261 discussion here. 03/01/2015 Thank you. your friendly neighborhood engine shop moderator, - Woogeroo | | | | | Joined: Dec 2000 Posts: 3,399 Gas Pumper | | Gas Pumper Joined: Dec 2000 Posts: 3,399 | Thanks alot Wong.. this will be a very good thread for anyone with questions on the 261. Tim, Dave and I have also collaborated to make a nice How-To. The unfinished work so far can be found at: The Venerable 261 GM 6 A Great Engine Choice for the AD Hopefully once it all ironed out, we can host it on Stovebolt as well. | | | | | Joined: Feb 2002 Posts: 2,877 Socket Breaker | | Socket Breaker Joined: Feb 2002 Posts: 2,877 |
Deve - that is golden information...
Thanks for writing it up... and also thanks to everyone who helped out.
-W
| | | | | Joined: Dec 2000 Posts: 3,399 Gas Pumper | | Gas Pumper Joined: Dec 2000 Posts: 3,399 | The thing is, when we all work together and combine our knowledge, putting aside personality and skill differences, we can do extraordinary things. None of the stuff I write about is ME. I write about what I know, then ask about what I don't. This foolproof method means better documentation. Add to that philosophy remembering that you didn't always know what you do, so explain in detail, thinking of the inquisitive young man YOU once were. There is no room for egotistical thinking, arrogance, and a know-it-all attitude. Kindness and the willingness to go the extra mile in documenting things for OTHERS. So, you know who you are, remove the stick thats in your arses, and start thinking about the needs of others. If you are SURE that I am not talking about you, then don't take offense. I say this because lately, I have been very impressed with the collaboration between some of the more high profile Bolters and feel really good about what we have, and what we CAN accomplish. Thanks to all. Everyone knows that anything with my name on it, can be placed on The StoveBolt. Sharing is why we bother doing this! | | |
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