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#1 |
Senior Member
![]() Join Date: Dec 2011
Location: Laurel, Mt.
Posts: 522
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71-72 Smog?
Although I won't be putting any smog equipment back on any of my pickups I have always been curious as to why some pickups had smog and others didn't? Both my '71's and my '72 were built in Fremont. One of my '71's is from Susanville, Ca and the other two are from here in Montana. None of them had smog when I got them and unless the exhaust manifolds had been swapped none of them had the holes on them for the smog lines. Were they only put on for pickups destined to higher populated areas?
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1972 Cheyenne Super 10 SWB,bucket seats,dealer cruise,tilt,tac,a/c,shoulder belts, 350/350 1971 K-10 Custom Deluxe 1971 K-10 Custom |
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#2 |
Registered User
Join Date: Jun 2010
Location: Upland Ca
Posts: 4,143
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Re: 71-72 Smog?
Also interested, and what equipment was included. My 72, built in Fremont and delivered to Chadbourne Chevrolet in Upland California, has/had a smog pump and air injection manifolds, evap canister.
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1972 C10 SWB, Air, PS, PB, 350/350THM. Second owner. 1965 Corvette roadster, 44K miles, 327/365 SHP, 4 speed, side exhaust, knockoffs, teak, second owner (bought in 1970), Have ALL numbers matching components. My frame off restoration thread: http://67-72chevytrucks.com/vboard/s...d.php?t=556703 |
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#3 |
Registered User
Join Date: Feb 2012
Location: Ruskin Florida
Posts: 4,559
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Re: 71-72 Smog?
Check your vin plate. It will say if it was built with California emissions or if it is out of state. Mine was out of state and did not have "all" of the emissions but had evap canister.
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70 swb 4x4 406sbc 700r4 203/205 d60/14blt locker yadda yadda http://67-72chevytrucks.com/vboard/s...88#post6935688 Yeller 72 Blazer 2wd conversion project "No Daggum Money" http://67-72chevytrucks.com/vboard/s...d.php?t=550804 LS1-T56 3.73 LSD super budget build Blanco-2014 Sierra SWB https://67-72chevytrucks.com/vboard/...d.php?t=810350 |
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#4 |
Moderator
![]() Join Date: May 2007
Location: Southern Cal
Posts: 20,003
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Re: 71-72 Smog?
My 72 was built here in fremont and has no emission equipment...but it was a 3/4 ton truck. My 72 1/2 ton had equipment.
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1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed. 1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck. RIP ElJay RIP 67ChevyRedneck RIP Grumpy Old Man |
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#5 |
Senior Member
![]() Join Date: Dec 2011
Location: Laurel, Mt.
Posts: 522
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Re: 71-72 Smog?
so did your 72 1/2 ton have something emissions related on your SPID?
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1972 Cheyenne Super 10 SWB,bucket seats,dealer cruise,tilt,tac,a/c,shoulder belts, 350/350 1971 K-10 Custom Deluxe 1971 K-10 Custom |
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#6 | |
Moderator
![]() Join Date: May 2007
Location: Southern Cal
Posts: 20,003
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Re: 71-72 Smog?
Quote:
Posted via Mobile Device
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1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed. 1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck. RIP ElJay RIP 67ChevyRedneck RIP Grumpy Old Man |
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#7 |
Registered User
Join Date: Jun 2010
Location: Upland Ca
Posts: 4,143
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Re: 71-72 Smog?
My SPID has YF5, California Emissions. The build sheet, but not the SPID, also has YF5, as well as NB2 California Emission Control, and V39 Exhaust Emissions Label, and YF6 Cal Proc Option which is emissions related but my research has yielded conflicting descriptions of what this is.
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1972 C10 SWB, Air, PS, PB, 350/350THM. Second owner. 1965 Corvette roadster, 44K miles, 327/365 SHP, 4 speed, side exhaust, knockoffs, teak, second owner (bought in 1970), Have ALL numbers matching components. My frame off restoration thread: http://67-72chevytrucks.com/vboard/s...d.php?t=556703 |
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#8 |
20' Daredevil (Ret)
![]() Join Date: May 2003
Location: Jefferson State
Posts: 13,621
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Re: 71-72 Smog?
As does my K20. It has the evap. canister but no pump or manifold fittings. I believe it was sold new as a California truck but am not 100% positive (I bought it in 1977 with black plates). I'm quite sure the GVWR also affected the smog requirements on California trucks, and most likely also for non-Calif. trucks -- for instance, half-tons may have come with smog equipment that was not required for 3/4 tons.
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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#9 |
Senior Member
![]() Join Date: Dec 2011
Location: Laurel, Mt.
Posts: 522
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Re: 71-72 Smog?
hmm.. interesting replies. before today i had never heard of YF5,NB2, or V39. i've had two '72 Highlanders in the past, one from Canada and one built in Flint and from Colo. that had no smog but had charcoal canisters. in fact every C10/K10 I've had or seen has had the charcoal can. and I've never seen a C20/K20 with either.
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1972 Cheyenne Super 10 SWB,bucket seats,dealer cruise,tilt,tac,a/c,shoulder belts, 350/350 1971 K-10 Custom Deluxe 1971 K-10 Custom |
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#10 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: 71-72 Smog?
i had a calf built c10 the only things it had were the charcoal cannister and that tranny carb sparky thingy//but my blazer same year but built on the east coast had the same stuff
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71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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