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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: zieg85 on February 21, 2015, 01:59:33 PM
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Here is the deal... My A.I.R. tube on my 1984 C10 with a 4.1L I-6 is in need of replacement. What do you folks in California do when they are no longer available and you can not find a good used ones? I am facing a rebuild and this one will not come out without crumbling to pieces.
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Can you fab one? I don't know the layout of the 6 cylinder ones, but you could probably make one fairly easily...
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Can you fab one? I don't know the layout of the 6 cylinder ones, but you could probably make one fairly easily...
It is nothing like the V-8 ones. It would have to be near perfect for the air cleaner housing to go back on it. This was the last year for the 4.1L and this configuration was not made that long, 1979 I know is different
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Any chance of posting a pic?
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i was getting ready to say i have one but its on my 79 4.1. didnt know theyre diffrent
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Any chance of posting a pic?
Here are a few pictures
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How's you welding skillz? You could use the more readily available v8 air tubes, and weld them up.
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How's you welding skillz? You could use the more readily available v8 air tubes, and weld them up.
zilch, the 2nd picture is where I had to put a 2K epoxy to seal a leak and one of the rear is frozen up. I soaked for 2 days and it still wants to twist. Anyone have a 84 book that gives a part # for this?
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I'm guessing you already checked the junk yards and pull aparts?
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Use copper tubing
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Is metal brake line the same size ?
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I have put out a WTB post and now know that it is GM part#14077292 that I need. Thanks for the suggestions, I may be forced to fabricate one since they are no longer available but I will cross that bridge when I have too.
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Is metal brake line the same size ?
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No, the fittings at the manifold are unique to A.I.R. tubes...
I would look for some v8 ones, since they are way more common, and join them with compression fittings if you have to, though brazing would be much cleaner.
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All you need Is for it to look like it works to pass the visual inspection.
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All you need Is for it to look like it works to pass the visual inspection.
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Here in Indiana they don't even open the hood. What counts is the tailpipe emissions run on a dyno treadmill of sorts. They inspect the exhaust system, check the gas cap to see it holds pressure and make sure it has a catalytic converter.
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Obviously the air pump adds air to dilute the exhaust gasses correct? Since I don't have a visual can I add air into the exhaust pipe and accomplish the same thing??? Any experts out there confirm this?
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No. A.I.R. Stands for Air Injection Reaction. The A.I.R. Pump supplies the air to the primary and secondary system. Think of it as post combustion combustion. If the spent gasses contain hydrocarbons and no oxygen it will not burn. Adding a small amount of oxygen into the exhaust manifold can help further burn off the HC's leaving the combustion chamber.
Did you fail emissions or are you trying to be proactive?
You can easily build a new set of pipes with copper or you can buy new manifolds or headers with A.I.R. setup.
If all you are getting is a visual verification of catalytic converter and exhaust integrity and the ASM test, why not just take it through?
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You can make these very easily or purchase a solution
http://www.summitracing.com/parts/hed-22830?seid=srese1&gclid=CLrzhYXu-sMCFQpk7AodCBIASQ
https://www.yearone.com/Product/1967-87-chevy-gmc-truck/rj434s
There are emissions legal headers too.
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http://forum.73-87chevytrucks.com/smforum/index.php?topic=7079.msg40754#msg40754
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Did you fail emissions or are you trying to be proactive?
I was hoping for an excellent response, THANK YOU SO MUCH. I passed emissions fine however the engine is on its last leg with oil consumption/loss/antifreeze in oil and a rod knock or rist pin/piston slap. The existing A.I.R. tube will more than likely be destroyed upon removal. I know of an engine out of a 1984 that I can buy to rebuild and have ready for the swap. That is the preferred route but if I don't have a plan to meet the emissions challenge I may do a V-8 TBI swap instead. I am just trying to gather all the missing pieces before I spend a dime. Easiest for me is a direct swap for obvious reasons. The carb on this 4.1L is set perfectly and is one of the few trucks I've had that start easily and you can take right off if you need to with no stalling issues.
Thanks again Vile
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If they only do the tailpipe test, gas cap and visual integrity of the exhaust with catalyst, I wouldn't even worry about it. Sounds like a good time to upgrade to V8 :)
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out here in Cali, they have made the laws so strict that I once failed a smog test because I used a piece of heater hose, instead of a moulded smog hose from the air cleaner to the AIR pump.They have marked hoses now for calif emissions.
What that did was force reputable auto parts stores to carry more emission parts for older vehicles. I got mine from Napa but it took a few days to get it to this store
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A LS motor from a wrecked later model suburban is what you need
Right at $1000 where I live including computer and harness
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