Smog Pump

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squareton

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Dec 9, 2021
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53
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Location
topeka ks
First Name
chris
Truck Year
1983
Truck Model
k2500 suburban
Engine Size
350
Maybe mine is a weird setup but I have a k20 1982 suburban. No egr valve and Im pretty sure the heavy duty (over 6k) trucks didnt have to have one. But, I have the original AIR pump installed and lines to the exhaust too but no cats only the y pipe all original. Ive sense removed the rusted y pipe exhaust and installed the 2-1/4 inch dual setup from lmc truck. Either way if you need pics from my 82 setup ill send them over
 

SirRobyn0

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Dec 6, 2019
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Location
In the woods in Western Washington
First Name
Rob
Truck Year
1984
Truck Model
C20
Engine Size
305
Maybe mine is a weird setup but I have a k20 1982 suburban. No egr valve and Im pretty sure the heavy duty (over 6k) trucks didnt have to have one. But, I have the original AIR pump installed and lines to the exhaust too but no cats only the y pipe all original. Ive sense removed the rusted y pipe exhaust and installed the 2-1/4 inch dual setup from lmc truck. Either way if you need pics from my 82 setup ill send them over
It would be interesting to know for sure. I have an 84 C20 305 that has EGR, AIR PUMP & CAT 8,600 GWRV, I thought that by the early 80's they all got EGR valves, but I could be completely wrong, it seems like there we are few interesting different factory set ups so I have no doubt your truck came that way.
 

C10MixMaster

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Dec 6, 2016
Posts
756
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Location
Kingman AZ
First Name
Ben
Truck Year
1977
Truck Model
C10 BIG10
Engine Size
ZZ4 350
Maybe mine is a weird setup but I have a k20 1982 suburban. No egr valve and Im pretty sure the heavy duty (over 6k) trucks didnt have to have one. But, I have the original AIR pump installed and lines to the exhaust too but no cats only the y pipe all original. Ive sense removed the rusted y pipe exhaust and installed the 2-1/4 inch dual setup from lmc truck. Either way if you need pics from my 82 setup ill send them over
It would be interesting to know for sure. I have an 84 C20 305 that has EGR, AIR PUMP & CAT 8,600 GWRV, I thought that by the early 80's they all got EGR valves, but I could be completely wrong, it seems like there we are few interesting different factory set ups so I have no doubt your truck came that way.

https://www.gmheritagecenter.com/gm-heritage-archive/vehicle-information-kits.html here's a link to the GM heritage website there you can down load the options manual for your your truck . In the section after the engines It will show the emissions equipment the factory installed depending on GVWR / engine/ comifornia / fed etc. For the suburban you want to get the truck manual to, it has more info in it.

My 77 heavy 1/2ton with cali smog came with an air pump, but no egr or cat.
 

squareton

Full Access Member
Joined
Dec 9, 2021
Posts
53
Reaction score
32
Location
topeka ks
First Name
chris
Truck Year
1983
Truck Model
k2500 suburban
Engine Size
350
https://www.gmheritagecenter.com/gm-heritage-archive/vehicle-information-kits.html here's a link to the GM heritage website there you can down load the options manual for your your truck . In the section after the engines It will show the emissions equipment the factory installed depending on GVWR / engine/ comifornia / fed etc. For the suburban you want to get the truck manual to, it has more info in it.

My 77 heavy 1/2ton with cali smog came with an air pump, but no egr or cat.
Thanks, I haven't tried anything from that site because I thought it was 50 dollars and wasn't really interested in knowing much beyond the gear ratio and axles. I can't find the stampings anywhere on either axle where it's supposed to be
 

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