Emmisions stuff - The 1947 - Present Chevrolet & GMC Truck Message Board Network

kevinr1970 · 09-07-2005, 01:47 PM

I was looking at my donor '87 lwb with 305 and noticed it doesn't have a smog pump or anything else going to the exhaust manifolds. Seems like a headers would be a breeze here.
I was also looking at my '86 GMC 4x4 with 305 and a friends '87 swb with a 350 and they both have smog pumps that attach to the exhaust manifolds.
I looked as close as I could at my '87 and it didn't look like there was ever a smog pump installed, but who knows 18 years later?
The sticker on my core support says: CATALYST, BPERG/ORC (I think). Does this say there is no smog pump?
Just curious as I don't really want to hassle with the pump if I don't have to.

*iceman7329* · 09-07-2005, 04:00 PM

It does not have one because it was never made wih one, you dont need it on that truck.

kevinr1970 · 09-07-2005, 10:36 PM

Why exactly do you say that? '87 swd with 305 not required to have a smog pump? Or ?

*iceman7329* · 09-07-2005, 10:39 PM

From what your sticker on your core support says it didnt have one from the factory, like mine, and you will not need it to pass an emmisions test.

*iceman7329* · 09-07-2005, 10:40 PM

PS- its not required to have one because it was made without one. 87 LWB didnt have them but the 4X4s did and some SWB did.

hotrodhomi · 09-08-2005, 01:22 AM

my '81 was a original 305 and it has one. I think it shows one on the sticker though.

kevinr1970 · 09-08-2005, 03:27 AM

Sounds odd, but I guess I have the proof in front of me to prove that out?

Quote:

Originally Posted by iceman7329

PS- its not required to have one because it was made without one. 87 LWB didnt have them but the 4X4s did and some SWB did.

66+81 · 09-08-2005, 04:09 PM

I thought all of them had all that stuff since 73? My 81 had a 4.1L in it with all that stuff on it. Pump and everything.

*iceman7329* · 09-08-2005, 04:18 PM

Ill find all my info on this and post it. Some didnt have it and some did, my uncles 79 short bed doesnt have the pump or anything.

Trimman · 09-08-2005, 05:55 PM

My 82 had a 305 stock it didnt have one.

kevinr1970 · 09-09-2005, 04:34 PM

I went by my dads house to get a look at my '86 GMC that has the smog pump. It says "AIR" on the sticker so I assume that is for the air (smog?) pump.

09-07-2005, 01:47 PM	#1
kevinr1970 Senior Member Join Date: Aug 2004 Location: Everett, WA Posts: 2,316	Emmisions stuff I was looking at my donor '87 lwb with 305 and noticed it doesn't have a smog pump or anything else going to the exhaust manifolds. Seems like a headers would be a breeze here. I was also looking at my '86 GMC 4x4 with 305 and a friends '87 swb with a 350 and they both have smog pumps that attach to the exhaust manifolds. I looked as close as I could at my '87 and it didn't look like there was ever a smog pump installed, but who knows 18 years later? The sticker on my core support says: CATALYST, BPERG/ORC (I think). Does this say there is no smog pump? Just curious as I don't really want to hassle with the pump if I don't have to. __________________ 2009 Honda Fit CfC (bsf 44.9 mpg) 2000 Tahoe Limited 1991 GMC CrewCab Dually 2wd, will end up swb, not dually and replace CCswb below 1991 GMC CrewCab Dually 4x4, just going to fix things up for now 1982/1989 K5/GMC Jimmy 2wd 1987 GMC 1/2 ton swb 2wd Crew (sold)

09-07-2005, 10:36 PM	#3
kevinr1970 Senior Member Join Date: Aug 2004 Location: Everett, WA Posts: 2,316	Why exactly do you say that? '87 swd with 305 not required to have a smog pump? Or ? __________________ 2009 Honda Fit CfC (bsf 44.9 mpg) 2000 Tahoe Limited 1991 GMC CrewCab Dually 2wd, will end up swb, not dually and replace CCswb below 1991 GMC CrewCab Dually 4x4, just going to fix things up for now 1982/1989 K5/GMC Jimmy 2wd 1987 GMC 1/2 ton swb 2wd Crew (sold)

09-07-2005, 10:40 PM	#5
iceman7329 Account Suspended Join Date: Mar 2005 Posts: 453	PS- its not required to have one because it was made without one. 87 LWB didnt have them but the 4X4s did and some SWB did. Last edited by iceman7329; 09-07-2005 at 10:43 PM.

09-08-2005, 04:09 PM	#8
66+81 Registered User Join Date: Jul 2005 Location: Elberton GA Posts: 130	I thought all of them had all that stuff since 73? My 81 had a 4.1L in it with all that stuff on it. Pump and everything. __________________ 1966 Chevy C10 longbed stepside 350/350 1981 Chevy Custom Deluxe C10 short fleet 305/350

09-08-2005, 05:55 PM	#10
Trimman Registered User Join Date: Jan 2005 Location: Hixson TN. Posts: 74	My 82 had a 305 stock it didnt have one. __________________ 82 C-10 Scottsdale LB owned since 89 350 crate vortec heads Crane 1.6 full rollers edelbrock 1406 edelbrock performer eps intake dynomax headers/flowmaster 70's BTO 700r4 level 3 custom 2 piece driveshaft 12 bolt gov loc w/3.08

09-07-2005, 04:00 PM	#2
iceman7329 Account Suspended Join Date: Mar 2005 Posts: 453	It does not have one because it was never made wih one, you dont need it on that truck.

09-07-2005, 10:39 PM	#4
iceman7329 Account Suspended Join Date: Mar 2005 Posts: 453	From what your sticker on your core support says it didnt have one from the factory, like mine, and you will not need it to pass an emmisions test.

09-08-2005, 01:22 AM	#6
hotrodhomi Registered User Join Date: Apr 2004 Location: Sacramento Posts: 3,737	my '81 was a original 305 and it has one. I think it shows one on the sticker though.

09-08-2005, 04:18 PM	#9
iceman7329 Account Suspended Join Date: Mar 2005 Posts: 453	Ill find all my info on this and post it. Some didnt have it and some did, my uncles 79 short bed doesnt have the pump or anything.

09-09-2005, 04:34 PM	#11
kevinr1970 Senior Member Join Date: Aug 2004 Location: Everett, WA Posts: 2,316	I went by my dads house to get a look at my '86 GMC that has the smog pump. It says "AIR" on the sticker so I assume that is for the air (smog?) pump. __________________ 2009 Honda Fit CfC (bsf 44.9 mpg) 2000 Tahoe Limited 1991 GMC CrewCab Dually 2wd, will end up swb, not dually and replace CCswb below 1991 GMC CrewCab Dually 4x4, just going to fix things up for now 1982/1989 K5/GMC Jimmy 2wd 1987 GMC 1/2 ton swb 2wd Crew (sold)

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