For a 70 GS 455 were the original clamps for the bypss hose 5/8 inch corbin? Page 1-10.4 of the Aseembly manual is not clear on this issue.
Good question Jim, I have been trying to figure out this one for years. I use the corbin type and they work fine, Pain to get on though even with the correct pliers. No info in the 71 assembly manual either.
I thumbed through the chassis manual to see if I could get a clear picture of that particular area, and came across the side view cross ssection of the 350 and 455 engines. On the 350, it is very apparent that they are the corbin clamps. I can;'t tell on the 455 picture. And I would imagine that they're the same ones as the clamps on the breather hose. It's amazing to me that these clamps were used on this application, as well as the pinch clamps on the heater hoses. It doesn't seem like they would be up to the task of holding the pressure.o No: Maybe a little indian head shellac?
Duh! What I found was these clamps were installed at the engine plant, the part number for the hose is in the engine assembly books, but not the hose clamp info. I looked at some lit that shows '70 engines on assembly at the engine plant and they are not there. So I'm no help. what's a corbin clamp anyway? I think the bypass hose had a clamp on, not a screwed on clamp, but one you had to use pliers to get loose.
For what its worth When I bought my 69 Riviera in 84, it had the original bypass hose. The thermostat side still had a pinch type wire clamp on it. It wound up breaking in two pieces upon removal. All the proffesionally restored cars I saw at Batavia last year had the Wittek clamps on the bypass hose. Correct? who knows. But it seemed like the accepted way based on my observations
I installed the tower clamps on mine when I put it back together. It had already been replaced and had worm gear clamps installed when I bought the car. I had assumed that is what they used, since I had seen it in other cars.o No:
I could not find any info on the bypass hose but here is a diagram for a '68 400-430 motor. Is a corbin clamp the same as a pinch clamp?
I always assumed that they were pinch clamps since Olds of this vintage used them and the heater hoses on Buicks used them. If someone is relying on something for concurs' I would love to know what it is. The best evidince seems to be that 430s and 350s used them. Using old cars that may be original has its own perils.
For everyones info I believe Corbin is a company name and the only clamps that are called Corbin are the type that have a single round wire cross section with two ears that are pinched with pliers. These are used on the heater hoses. The flat type pinch clamps used on the fuel and vapor lines that are green, red, yellow are not Corbin type but may just be called pinch clamps.
In current fuel sys terminology, we call them "constant tension" clamps. Generically speaking we call the Corbin style a "single wire" (there are also double-wire applications), and the band style "CTB" for Constant Tension Band, for what it's worth. Add a screw and it's a whole 'nother ball game. Devon
I got the answer that matters for concours from Brad C. They expect to see the Corbin clamps and not tower or any screw type clamps on the bypass hose.
I've seen two different definitions for "corbin" ...can we come to a consensus on which type they really are? Single wire clamps, or the bands?
Adam, The bypass hose clamp style also depends on which year you are talking about, so don't "assume" they are the same style for every year. Duane PS. Some of the heater hose clamps also changed, depending on the year and assembly plant.
Pinch clamp I put the witteck type clamp on my bypass because the pic in the book did not show it well. Thinking the high pressure would use that clamp. Next to the bypass is the heater hose that would dead head unless the heater is used and the picture did show it being a pinch clamp. I just got my motor started during my restoration and the heater hose did not leak. For what it is worth I purchased the NAPA pinch clamp pliers. The holders on the end swivel and it locks the clamp open until you release it. ( Made in the USA) I am looking for a couple of the fender bolts for the bottom of the fender that the nut is attached to the clip to the bottom of the cowel. Mark
I believe the explanation for depicting the heater hose as a pinch clamp in the assembly manual and not being clear on the bypass is that the bypass hose was already installed at the engine plant so it was not an item for the assembly line. Some Olds we have used the pinch wire clamps in that location. It was not a lot of fun putting on the correct ones clamps on the Olds after the fact. I used Sears locking pliers on the pinch clamps. The bottom line is though if the judges say they must be pinch clamps and you are going to have the cars judged you may want to use the pinch style unless you can prove they are not correct.
Jim, That is incorrect. I did NOT tell you to use Corbin clamps. You must understand the difference between the styles used. I even gave you examples. Also, different years used different clamps. It is model year specific for the style used. You PM'd me a specific question and I responded with a specific answer. I didn't want to see you take a chance on having to repair a fresh concours restoration because you used the wrong style clamp. For your specific application, I advised you to use a Pinch clamp and even provided a link to show you the style I was speaking of. As Duane said, different plants had different protocol's and assuming every bypass hose should be a Pinch style clamp would be wrong. ***
Jim Lore, The reason you did not get an "immediate" response from either Brad or myself regarding this question, is that it often takes some time to go through all the notes/reference material to answer it. Plus once the question is raised, many others often request the same information for their year/assembly plant cars, therefore we often need to put together a "reference set" to handle all these additional questions. (I cannot find the "reference set" I had originally put together for judging, so I am putting together another one right now.) Also, and this is probably the most important thing you or anyone could know about restorations. When you get to the finer details of a restoration the parts that were used all depend on who was in control of that part of the project, or in other words, it's a matter of jurisdiction. Buick had jurisdiction over their engine sub assemblies, and for the final assembly of every car built at Flint, just like Olds had jurisdiction over their engine sub assemblies, and for the final assembly of every car built at Lansing. Then you have GMAD with jurisdiction over every Buick & Olds final assembly built at every other plant, so when you put everything together it gets very interesting. With all the above being said, please don't compare what is correct on an Olds engine to what should be correct for a Buick motor. It's apples and oranges, as each was assembled by a different authority. If we were going to do that we could just look at a Chevelle and get all the information we needed. Now to your particular answer; There were 3 different types of clamps used on the various hoses during the 1970 model year, namely Tower Clamps, Corbin Clamps (single wire loops), and the 3-fingered spring steel Band Clamps. Now, Brad said they were not Tower Clamps or Corbin Clamps, so you have your answer. Duane
