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#1 |
Account Suspended
Join Date: May 2009
Location: las vegas nv
Posts: 1,493
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Getting rid of smog equipment
I have a 72 350 truck. Im sure some of you are tired of my ignorant questions but I am learning as I go along. I am to the point of reassembly of my intake and carb I purchased and want to get rid of all the smog equipment.
From the canister I have a couple lines that go down into that area. They are not hooked up to the smog canister though. I believe they went to a valve on the stock manifold. The manifold has a vacuum type port thread into the passenger side of the manifold. it has two 1/4" or 5/16" ports on it. One def went to the smog canister. The other I am not sure where it went to. Anyone know? Or can you help me? Also the canister has a tube that goes to the front drivers side valve cover, I think I can just plug that with no problems. Then out the bottom of the canister there is a line that appears to go down to the hard line along the frame. Where does this go and what can I do with that? Thanks for all your help, I can get you any pictures if needed. Last edited by vegaschevy; 08-21-2009 at 01:29 PM. |
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#2 |
Registered User
Join Date: Jan 2006
Location: Take Off
Posts: 1,908
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Re: Getting rid of smog equipment
I would just remove all the lines and canister and plug everything up. However, the gas tank may then start to vent fumes into the cab, from what I've read.
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#3 |
Account Suspended
Join Date: May 2009
Location: las vegas nv
Posts: 1,493
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Re: Getting rid of smog equipment
Some of the lines were just dangling there. THat is why I am trying to figure out if I can just get rid of some of this stuff or what can be gotten rid of completely. Plugging lines only masks what I am trying to do especially when the canister comes out so easily.
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#4 |
member #16
![]() Join Date: Dec 1999
Location: Yuba City Ca.
Posts: 3,618
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Re: Getting rid of smog equipment
The vacuum solenoid on your manifold is for TCS (transmission controlled spark) which can be discarded. It only allows vacuum advance in high gear. You should find a relay and wiring to trans that goes with it.
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john http://67-72chevytrucks.com/vboard/showgroups.php board vendors ![]() http://www.flickr.com/photos/1745471...7602865984234/ |
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#5 | |
Account Suspended
Join Date: May 2009
Location: las vegas nv
Posts: 1,493
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Re: Getting rid of smog equipment
Quote:
Ill have to get some more pics of everything once I get closer tomorrow of getting the carb on and everything. I just cannot figure out where everything else goes. Maybe Ill go take pics for everyone real quick. Then we can go through them one by one. LOL |
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#6 |
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Join Date: May 2009
Location: las vegas nv
Posts: 1,493
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Re: Getting rid of smog equipment
Ok check back shortly, I am downloading pics of ports, line etc.
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#7 |
Account Suspended
Join Date: May 2009
Location: las vegas nv
Posts: 1,493
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Re: Getting rid of smog equipment
Ok here are some pics,
I want to get rid of the tall filler neck, and the front vent as it appears to go to the smog stuff. ALso in this pic is the vent from the drivers side manifold. Can that be just taken off? ![]() These next two pics are for the front two ports on the front of the manifold. The passenger side one in the second pic gets a fitting and goes to the heater box I believe. The one on the drivers side I ahve no idea? maybe I can plug it. ![]() ![]() This next pic shows the port in the rear of the manifold. What goes in it? The fitting in the second pic? I think so, what goes to this fitting? ![]() ![]() I believe this is the sensor someone said to just get rid of all together. Is this correct? part of the TCS solenoid? ![]() THe line along the frame from rubber to steel, comes out of the bottom of the charcoal canister which will be removed from the truck. Where does that line go? can it be blocked? removed? left open? ![]() This comes off my heater assembly. what is the line with the screw? why is it plugged? ![]() What does this do? its unhooked, im sure I can pry it back properly. Any ideas? ![]() The line coming out of the brake booster, originally threaded into the rear of the carb, no provision I believe on the new carb. Where would it now go? ![]() |
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#8 |
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Join Date: May 2009
Location: las vegas nv
Posts: 1,493
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Re: Getting rid of smog equipment
This line comes off the rear of the motor somewhere, where does it go? what does it do?
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#9 |
Moderator
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Location: Southern Cal
Posts: 20,004
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Re: Getting rid of smog equipment
Your third pic, from the bottom up, is the cowl vent control. This shuts off the outside airflow when the A/C is on. You need to run a vacuum line to this actuator. It shuts when the A/C is on, opens when the heater is on, A/C off.
The pic above that is your heater shutoff valve. That needs to be closed when the A/C is on, prevents the heater core from heating up. Some had 2 vacuum nipples on them. Only one of them actually works. I would guess that the plugged line is connected to the nipple that doesn't work. You can probably just pull that line off. Your very first pic is the heat riser tube, not a filler tube. You can pull the tube, and the "stove" on the exhaust manifold and sell those. People looking to restore a truck to original are always looking for this setup.
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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 Last edited by leddzepp; 08-21-2009 at 03:57 PM. |
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#10 |
member #16
![]() Join Date: Dec 1999
Location: Yuba City Ca.
Posts: 3,618
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Re: Getting rid of smog equipment
If there is no vacuum port on the carb you can use a fitting like this http://www.corvette-paragon.com/p-35...m-fitting.aspx and use a brake booster hose instead of the tube. The other small hose from your trans modulator (last pic) will plug on the small nipple. Heres a vacuum diagram for your a/c hoses.
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john http://67-72chevytrucks.com/vboard/showgroups.php board vendors ![]() http://www.flickr.com/photos/1745471...7602865984234/ Last edited by john; 08-21-2009 at 03:55 PM. |
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#11 | |
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Join Date: May 2009
Location: las vegas nv
Posts: 1,493
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Re: Getting rid of smog equipment
Quote:
THe oil filler neck sticks up about 10" as well and has a support to the intake manifold, if I get rid of it all together what can I do? buy a press in filler plug? Ill fix the cowl vent piece and remove the tube with the nail in it. perfect. |
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#12 | |
Account Suspended
Join Date: May 2009
Location: las vegas nv
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Re: Getting rid of smog equipment
Quote:
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#13 | |
Moderator
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Location: Southern Cal
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Re: Getting rid of smog equipment
Quote:
Just make sure which nipple on the heater switch actually controls it, and which is just an extra "stud" so to speak.
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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 Last edited by leddzepp; 08-21-2009 at 05:14 PM. |
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#14 |
Between Trucks...
Join Date: Mar 2002
Location: Los Angeles, CA.
Posts: 3,830
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Re: Getting rid of smog equipment
You'll need that vacuum line going to the tranny hooked up to manifold vacuum. Tranny won't shift right without it.
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#15 |
Account Suspended
Join Date: May 2009
Location: las vegas nv
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Re: Getting rid of smog equipment
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#16 |
Between Trucks...
Join Date: Mar 2002
Location: Los Angeles, CA.
Posts: 3,830
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Re: Getting rid of smog equipment
Right.
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#17 |
Firefighter
Join Date: Feb 2001
Location: Yellville, Ar, USA
Posts: 1,943
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Re: Getting rid of smog equipment
The line off of rear of motor, transmission modulator, front drivers side plug it, can be used for heater hose, but use the pass side front, port in rear use for modulator valve, and you can hook up brake booster here also unless you want to use the one in the back of the carb base. And you can remove the pipe for the air cleaner too, tcs solenoid also, line by frame plug it, it goes up into cab near pass side next to fuel line. Heater valve I am unsure where the line goes, and the valve on firewall is for your a/c which I assume does not work anyway. I hope this helps!!!!
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'72 Chevy SWB 350 Auto '67 GMC LWB 350 4 speed '70 Chevy 4x4 Stepside 350 Auto Yellville, Ar. USA ![]() ![]() |
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#18 | |
Account Suspended
Join Date: May 2009
Location: las vegas nv
Posts: 1,493
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Re: Getting rid of smog equipment
Quote:
I got most of it. What is the Modulator valve? I do not think the carb base has a port for the brake booster as I am going with a summit carb (holley) AC actually works just not on high, So Ill fix the pin in the arm and it should work better. LOL anything else I miss? |
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#19 |
70 Chevrolet=Obsession
Join Date: Jun 2009
Location: nice ca
Posts: 1,067
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Re: Getting rid of smog equipment
That is your EEC or Evaporative Emissions Control line which goes to your gas tank. It should be removed at the tank end and plugged otherwise you will smell gas fumes in the cab especially when the tank is full. Also, you should change to a vented gas cap otherwise you will get vacuum problems. Just my $.02
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![]() ![]() ![]() I'm Just like my truck. Old, Ugly and Grouchy. Except my truck starts easily in the morning and doesn't smoke! IT'S NOT EASY BEING GREEN! -Kermit the frog 1970 Chevrolet C-10 Longbed Stepside : 350, Muncie M20, 3.08 GM corp. positraction Forest green exterior/light green interior(Where all my money goes) 1996 Toyota Corolla (Parts runner) |
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#20 |
Firefighter
Join Date: Feb 2001
Location: Yellville, Ar, USA
Posts: 1,943
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Re: Getting rid of smog equipment
The Modulator valve is located on the passenger side of your transmission, if you have a Turbo 400 it will be on the side, if you have a Turbo 350 it is toward the rear of the passenger side. The Modulator valve controls shifting, you should be able to see the metal line coming from the rear of the motor down the side of the transmission.
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'72 Chevy SWB 350 Auto '67 GMC LWB 350 4 speed '70 Chevy 4x4 Stepside 350 Auto Yellville, Ar. USA ![]() ![]() |
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#21 |
Firefighter
Join Date: Feb 2001
Location: Yellville, Ar, USA
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Re: Getting rid of smog equipment
Also if your carb does not have the provision for the brake booster then you can use the fitting in your hand in the pic, just hook it up to one side and your modulator valve line to the other.
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'72 Chevy SWB 350 Auto '67 GMC LWB 350 4 speed '70 Chevy 4x4 Stepside 350 Auto Yellville, Ar. USA ![]() ![]() |
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#22 | |
Account Suspended
Join Date: May 2009
Location: las vegas nv
Posts: 1,493
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Re: Getting rid of smog equipment
Quote:
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#23 |
Account Suspended
Join Date: May 2009
Location: las vegas nv
Posts: 1,493
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Re: Getting rid of smog equipment
I got everything else hooked up but still have not removed the transmission solenoid thing that hooks to vacuum. Also have not hooked up the vacuum line off the back of the motor that goes to the transmission.
The tranny solenoid I can unplug, do theh wires need to be jumped or can i leave it unplugged? Also the vecuum line for the tranny can I just hook it to manifold pressure? the port on the passenger side rear of the motor? |
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