Air pump

[flatford39]

I have a 1980 CK 1/2 ton pick up with the 350 engine. I just purchased this vehicle and I want to change out the exhaust. It presently has dual exhaust that someone installed and they are pretty loud. One of the tail pipes is missing too. As I am looking at it I notice the catalytic converter is gone. I also don't see an air pump on it either although all the other pollution components are intact. Did 1980 CK's with the 350 have the air pump?? Since I bought it out of state I am going to have to take it through Illinois emissions at least once before they exempt it I believe.

Any help will be appreciated.

[bake74]

     You will have to visit the Illinois DMV website and search for requirements unless someone who lives there knows.  I did a quick search but did not find the answer.  But found some very interesting facts.
     due to the Governor signing legislation that eliminates the idle exhaust and gas cap tests after January 31, 2012. As part of this legislative change, the following vehicles will be exempt from the emissions test requirement:

Pre-2007 model year gasoline-powered vehicles with a manufacturer's gross vehicle weight rating (GVWR) between 8,501 and 14,000 pounds.
All gasoline-powered vehicles with a manufacturer's GVWR greater than 14,000 pounds (regardless of model year).

Most gasoline-powered cars model year 1996 or newer are subject to emissions testing after they are 4 years old. Heavy duty trucks 2007 or newer are also subject to testing if they weigh between 8,501 pounds and 14,000 pounds.  (you guys are lucky).

In many states, failing to obtain a smog certificate makes it illegal to register and operate the vehicle. But in Illinois, it also makes the driver illegal. If you do not get your vehicle tested on schedule, or you do not bring a failing vehicle into compliance, your Illinois driver's license may be suspended. 
     That right there is harsh, it's like you are connected at the hip to your vehicle.

[flatford39]

Thanks for the response Bake,

I appreciate it. I know that I have to bring the truck into Illinois compliance before they issue tags. I also know once I do that with a vehicle this old that I am exempt from future testing. Read into that what you want.

My question about this truck relates to the air pump. I can see no evidence that it was ever installed from the factory. This truck has all the other pollution components intact outside of the catalytic convertor.

The passenger side exhaust manifolds do not have ports for the air pump to attach to on the center ports albeit there are ports (plugged) on both ends. The drivers side has ports on all four that are plugged as well. These plugs look factory to me but who knows after all these years.

I have an air pump and all the tubing on hand from a 79 vehicle so I could install it all on this engine but my question is still, does the 1980 350 require one from the factory???

If I can avoid installing the pump would be a time saver.

[bake74]

     Ok, I did a search in our tech section and looked at the 1980 service manual, in section 6E page 6E-17 (page 679) bottom left corner shows the C/K series trucks with the 350/400 gas engine option (454 option is top left corner).
     You can see the diagram for the air pump.  The only thing I did not see was the federal truck option, weather it had a air pump or not.  You can use the link above and see it or just go to the tech section and look up the service manuals.

[77 longstep]

I can't answer the question that you posed but maybe can offer some help.

Here is the link to the GM Heritage center for the 1980 model year Chevrolet trucks.  I belong to the Performance Years board and one of the members there is a long time GM employee.  He posted the 1977 model year link, in a response to a question I had.  Found it to be a good resource and hope you do as well.

http://www.gmheritagecenter.com/docs/gm-heritage-archive/vehicle-information-kits/Chevrolet-Trucks/1980-Chevrolet-Truck.pdf

Greg

[flatford39]

Greg,

Thanks for the info.

Tom

[bake74]

I can't answer the question that you posed but maybe can offer some help.

Here is the link to the GM Heritage center for the 1980 model year Chevrolet trucks.  I belong to the Performance Years board and one of the members there is a long time GM employee.  He posted the 1977 model year link, in a response to a question I had.  Found it to be a good resource and hope you do as well.

http://www.gmheritagecenter.com/docs/gm-heritage-archive/vehicle-information-kits/Chevrolet-Trucks/1980-Chevrolet-Truck.pdf

Greg

     There is a link to the GM Heritage web sit in the tech section under "gm tech info in pdf form".