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Old 01-28-2010, 08:29 PM   #1
SMiller
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What year did emissions come standard?

I am looking at a '85 C20 and K30 and was wondering if it will have all the emissions stuff on it. What year did GM start adding all the stuff? Thanks!

Last edited by SMiller; 01-28-2010 at 08:39 PM.
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Old 01-28-2010, 08:31 PM   #2
jared87350
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Re: What year did emissions come standard?

i think it was 72
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Old 01-28-2010, 08:42 PM   #3
95 S_Trucker
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Re: What year did emissions come standard?

certain stuff came out out at different times, my 85 k10 pretty much had every emission device imaginable on it

catalytic converter
AIR pump
Evap emissions control
EGR
Heat riser

yours being a k30 with a higher GVW means it was in a different tier for emissions. Does your truck still have the sticker on the core support?
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Old 01-28-2010, 09:45 PM   #4
sdime95
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Re: What year did emissions come standard?

i know 75 is when cats were manditory not to sure about the other stuff my 84 has a butt load of emissions equp.
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Old 01-28-2010, 10:04 PM   #5
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Re: What year did emissions come standard?

'73 was the year that it all turned to crap.

except that is for chevy trucks that is..... thats when they started to get good.....
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Old 01-28-2010, 10:17 PM   #6
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Re: What year did emissions come standard?

It varies greatly, My 85 C20 suburban had a 350 with 2 smog pumps duel exhaust with no catalytic converters.
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Old 01-28-2010, 10:19 PM   #7
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Re: What year did emissions come standard?

I'm not sure when 1/2 tons got cats, 75 or 76 I think. as for 3/4 tons, they didn't get cats, etc until 79. up to 78 everything with a GVW over 6001lbs. was emissions exempt. 79 and later, you had to have a GVW of 8501lbs to be exempt. Basically that leaves dually's and their 10000lbs GVW exempt but I don't know when that ended.

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Old 01-29-2010, 12:14 AM   #8
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Re: What year did emissions come standard?

idk cuz i had a 78 chevy and i was emmisions exempt... they just did my safety and thats it... i have and 81 blazer now which i think is the same way...
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Old 01-29-2010, 01:11 AM   #9
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Re: What year did emissions come standard?

It depends your state mine don't start testing tell 86 some like utah is 67 tell now on cars.
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Old 01-29-2010, 01:32 AM   #10
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Re: What year did emissions come standard?

California is '75 and Up I believe
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Old 01-29-2010, 03:55 AM   #11
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Re: What year did emissions come standard?

73 is when they put their foot in the dorr with vacc sensors.

74 (my truck) has the air pump /w/ the exhaust pick up off of the collectors, not the header-tubes. so accuracy, 74 was official.
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Old 01-29-2010, 08:11 AM   #12
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Re: What year did emissions come standard?

I know for a fact my '77 3/4 ton, 6300 gvw had no cats factory, just the PCV system. No vapor canister, no A.I.R. pump, nothing. My uncle bought it new and it was titled as the weight of 4483. (commercial pickup truck).
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Old 01-29-2010, 09:38 AM   #13
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Re: What year did emissions come standard?

Dunno about 1/2 and 3/4 ton trucks, but 1-ton trucks didn't get cats until 87. The 1/2 and probably 3/4 had cats long before then.
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Old 01-29-2010, 09:38 AM   #14
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Re: What year did emissions come standard?

i wanna say 86 here in texas they had to put mine as an 85 cause i didnt meet standards.. i was a year off
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