1st year for smog? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

337 · 01-18-2004, 04:53 PM

What was the first year for smog for these trucks?
I know it saw it somewhere on the board.
I tried searching for it and could not find the thread.
Thanks.

toms68cst · 01-18-2004, 05:03 PM

Many 68's were equipped with smog pumps. As far as I know no 67's were. I think only 1/2 tons were equipped not 3/4 ton's and above.

337 · 01-18-2004, 05:06 PM

Thanks.
Do you know what years require smog pumps?
Is this a state issue?

bigjimzlll · 01-18-2004, 05:57 PM

My 67 CA truck had all of the smog crap

Project1970 · 01-18-2004, 06:07 PM

It's most certainly a state thing...my '70 has never had a smog pump or anything of the sort on it.

stelth2002 · 01-18-2004, 07:19 PM

68 was first for PCV i thought. I didnt think there was any smog on 67 and lower

71Rat · 01-18-2004, 08:17 PM

i beleave pcv has been on engines since the mid 60's. the car co.'s didnt invent pcv for emissions. if i can remember correctly is was to prevent blow by and make the engines last longer since they wouldn't get gas into the oil and thin it out. if i am wrong someone please correct me. as for emissions i would guess it mattered what state it was in also. mine only had a charcoal canister.

toms68cst · 01-18-2004, 09:53 PM

I agree it seems that CA trucks/cars had smog stuff earlier than the rest of the country.

I think around 70-71 they made the transitiion to heat risers rather than the smog pump set up. I've never seen on factory equipped with both in our series.

I think 68 was the first year they were widly equipped nation wide with smog pumps.

Kenneth Brown · 01-18-2004, 10:47 PM

I can't tell you when it happened but I can say that 68 begins the year that you must have some sort of emmissions products. 67 and older may have an open element air cleaner where-as 68 and newer may not, at least for inspection purposes.

Cat Fuzz · 01-19-2004, 12:16 AM

My 69 3/4 ton had no smog pump. Just a heat riser, which I removed when it broke.

whitesswj · 01-19-2004, 01:54 AM

68 was first w/ PVC valve. Here in Missouri, they require that if it is equipped w/ the smog devices, it must have it. However if it was made before 83 or 4 you can take those divices off, but if the devices are still there they have to be in working order. after 83 they have to working period. I'm a MO state safety inspector #900023810. It is a state thing. Go to your local State Hwy patrol and ask for an inspection, free here in mo!

whitesswj · 01-19-2004, 01:55 AM

Anything from CA will have it.

68CST327 · 01-19-2004, 02:35 AM

I'm an engine novice. What kind of smog devices should I be looking for? Where do they connect? What do they look like?

krazy_texan · 01-19-2004, 04:42 AM

my 72 had it, never seen it on any other truck

*ILIVE4TRUCKS* · 01-19-2004, 05:20 AM

only 1/2 ton calif trucks had smog. None of the 3/4 trucks had it.

Longhorn Man · 01-19-2004, 08:12 AM

My 70 owners manual showed a bunch about smog stuff...but I haven't seen my manual for a couple years now.

MrGoodpliers · 01-19-2004, 11:02 AM

My '69 built and sold in Atlanta had it, but it's not required in GA, so maybe it was slated to be shipped to CA?

toms68cst · 01-19-2004, 11:09 AM

I don't know how It works but here's my smog pump. It's a belt driven pump with a bunch of plumbing to my exhaust manifolds.

toms68cst · 01-19-2004, 11:39 AM

Quote:

Originally posted by MrGoodpliers
My '69 built and sold in Atlanta had it, but it's not required in GA, so maybe it was slated to be shipped to CA?

I think by 68 smog pumps were required nationwide on all 1/2 tons not just CA. Canada would be another story though.

Instead of smog pumps some 68's and later were equipped with the heat risers.

I don't know of any other hard and fast rules.

01-18-2004, 04:53 PM	#1
337 Registered User Join Date: Jan 2004 Location: San Antonio, TEXAS Posts: 253	1st year for smog? What was the first year for smog for these trucks? I know it saw it somewhere on the board. I tried searching for it and could not find the thread. Thanks.

01-18-2004, 05:03 PM	#2
toms68cst Registered User Join Date: Jun 2000 Location: Bismarck, ND Posts: 4,282	Many 68's were equipped with smog pumps. As far as I know no 67's were. I think only 1/2 tons were equipped not 3/4 ton's and above. __________________ Unrestored 68 C-10 CST. Original 327. 4-Speed CH465. 50k or so miles. TREASURER, Drum Brake Club.

01-18-2004, 05:57 PM	#4
bigjimzlll Senior Member Join Date: Dec 2001 Location: Redding,CA...USA Posts: 4,736	My 67 CA truck had all of the smog crap __________________ It's called "drag racing" if they called it "tic..tic..WHAM!..BANG! F*&K!!!", they'd have to keep the magazines under the counter with the other men's publications click the clicky to join the site.... http://67-72chevytrucks.com/vboard/payments.php 67 lwb..first hotrod in 25 years..540 best ET is 9.45 @ 141.44 Anderson,CA

01-18-2004, 06:07 PM	#5
Project1970 14.1 @ 96MPH Join Date: Jul 2001 Location: Mesa, AZ Posts: 2,811	It's most certainly a state thing...my '70 has never had a smog pump or anything of the sort on it. __________________ Project1970 - LS1 Swap Complete!

01-18-2004, 07:19 PM	#6
stelth2002 Young Gun wth Fast Inline Join Date: Jan 2002 Location: Idaho Posts: 1,475	68 was first for PCV i thought. I didnt think there was any smog on 67 and lower __________________ 1967 Chevrolet LWB with built 292! 415 ft. lbs of torque, 4 speed :O with 27% overdrive too, 3.73 Posi. Frame and body done... getting painted!!!

01-18-2004, 05:06 PM	#3
337 Registered User Join Date: Jan 2004 Location: San Antonio, TEXAS Posts: 253	Thanks. Do you know what years require smog pumps? Is this a state issue?

01-18-2004, 08:17 PM	#7
71Rat ran out of money Join Date: Apr 2003 Location: northern, NJ Posts: 925	i beleave pcv has been on engines since the mid 60's. the car co.'s didnt invent pcv for emissions. if i can remember correctly is was to prevent blow by and make the engines last longer since they wouldn't get gas into the oil and thin it out. if i am wrong someone please correct me. as for emissions i would guess it mattered what state it was in also. mine only had a charcoal canister. __________________ Modify everything, leave nothing alone!~

01-18-2004, 09:53 PM	#8
toms68cst Registered User Join Date: Jun 2000 Location: Bismarck, ND Posts: 4,282	I agree it seems that CA trucks/cars had smog stuff earlier than the rest of the country. I think around 70-71 they made the transitiion to heat risers rather than the smog pump set up. I've never seen on factory equipped with both in our series. I think 68 was the first year they were widly equipped nation wide with smog pumps. __________________ Unrestored 68 C-10 CST. Original 327. 4-Speed CH465. 50k or so miles. TREASURER, Drum Brake Club.

01-18-2004, 10:47 PM	#9
Kenneth Brown Registered User Join Date: Jan 2004 Location: Donie Texas Posts: 44	I can't tell you when it happened but I can say that 68 begins the year that you must have some sort of emmissions products. 67 and older may have an open element air cleaner where-as 68 and newer may not, at least for inspection purposes.

01-19-2004, 12:16 AM	#10
Cat Fuzz My son, my joy. Join Date: Sep 2003 Location: Spokane WA Posts: 463	My 69 3/4 ton had no smog pump. Just a heat riser, which I removed when it broke.

01-19-2004, 01:54 AM	#11
whitesswj Embrace the Redneck Join Date: Jan 2004 Location: Cabot, AR Posts: 1,334	68 was first w/ PVC valve. Here in Missouri, they require that if it is equipped w/ the smog devices, it must have it. However if it was made before 83 or 4 you can take those divices off, but if the devices are still there they have to be in working order. after 83 they have to working period. I'm a MO state safety inspector #900023810. It is a state thing. Go to your local State Hwy patrol and ask for an inspection, free here in mo! __________________ '01 Camaro *Son, you just can't get there from here...*

01-19-2004, 01:55 AM	#12
whitesswj Embrace the Redneck Join Date: Jan 2004 Location: Cabot, AR Posts: 1,334	Anything from CA will have it. __________________ '01 Camaro *Son, you just can't get there from here...*

01-19-2004, 02:35 AM	#13
68CST327 Registered User Join Date: Aug 2002 Location: USA Posts: 443	I'm an engine novice. What kind of smog devices should I be looking for? Where do they connect? What do they look like?

01-19-2004, 04:42 AM	#14
krazy_texan Registered User Join Date: Oct 2002 Location: West Des Moines, Ia Posts: 3,233	my 72 had it, never seen it on any other truck __________________ Krazy Texan My Trucks are made with Wrenches not Chop Sticks 1967 GMC 3/4 ton "Johnny Cash" 1990 v1500 suburban 1967 Ford f100 Swb 4x4 "green bean" GOD BLESS JESUS, JOHN WAYNE, AND THE ALAMO

01-19-2004, 05:20 AM	#15
ILIVE4TRUCKS AKA Phillip Johnson, AKA BANNED! Join Date: Sep 2001 Location: Grants Pass, Oregon Posts: 94	only 1/2 ton calif trucks had smog. None of the 3/4 trucks had it.



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01-19-2004, 08:12 AM	#16
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	My 70 owners manual showed a bunch about smog stuff...but I haven't seen my manual for a couple years now.

01-19-2004, 11:02 AM	#17
MrGoodpliers Registered User Join Date: May 2002 Location: Gainesville, Georgia Posts: 704	My '69 built and sold in Atlanta had it, but it's not required in GA, so maybe it was slated to be shipped to CA? __________________ We made Oklahoma a little after 3, Randy & his brother Bob & my old GMC...

01-19-2004, 11:09 AM	#18
toms68cst Registered User Join Date: Jun 2000 Location: Bismarck, ND Posts: 4,282	I don't know how It works but here's my smog pump. It's a belt driven pump with a bunch of plumbing to my exhaust manifolds. Attached Images __________________ Unrestored 68 C-10 CST. Original 327. 4-Speed CH465. 50k or so miles. TREASURER, Drum Brake Club.

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