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Topic: Emission control stuff gone

in Forum: C3 Fuel, Emission Control, and Exhaust Systems

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Emission control stuff gone (1/11)
1/2/15 9:09pm

cinor

Lifetime Member
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, - Canada

Vette(s):
1975 L48 Stingray 1992 LT1

Joined: 12/24/2013
Posts: 414

So it is obvious that the emission part of the 75 has been removed, probably long ago. Sooo my question is, is there a benefit to replacing it or not, it would simply be a lot easier to leave it all off, we do not have all the same rules as some of your states do so it would only be done if it changed how the car performed. What are your thoughts?

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Re: Emission control stuff gone (2/11)
1/2/15 10:21pm

Adams' Apple

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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 20108

If you're not trying to keep the car original, and your laws don't require any of it, I say "Good Riddance"!! Wink

That crap won't actually help performance at all.

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Joel Adams
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Re: Emission control stuff gone (3/11)
1/3/15 12:07am

F4Gary
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Grapevine, TX - USA

Vette(s):
1972 LT-1 convertible with factory air.

Joined: 8/26/2006
Posts: 1361

+1 on leaving it off. Just clutters up the engine compartment.

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Re: Emission control stuff gone (4/11)
1/3/15 12:07am

coles78
Former Member
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Lock Haven, PA - USA

Vette(s):
1978 Corvette

Joined: 1/1/2015
Posts: 1

My personnel opinion about emissions control stuff is that they represent everything that went wrong in the 70s with performance. I have gotten rid of that power sucking equiptment long ago. I know there are a lot of purists that disagree with my thoughts, but my vette will be far from stock as far as the motor goes. If done right the motor will thank you.

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Re: Emission control stuff gone (5/11)
1/3/15 8:35am

cinor

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, - Canada

Vette(s):
1975 L48 Stingray 1992 LT1

Joined: 12/24/2013
Posts: 414

Thanks guys. That's pretty much how I felt about it, good to hear you agree. Car seems to be all original so far except for the usual little things, but the car when I'm done will be what I want and that doesn't necessarily mean original (assuming I can afford what I want)

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Re: Emission control stuff gone (6/11)
1/3/15 9:09am

Gunslinger
Former Member
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Frederick, MD - USA

Vette(s):
1969 convertible L71 427/435 4-speed black interior

Joined: 9/8/2003
Posts: 3398

When I had a '78 L82 the AIR was already gone. After a while I removed the EGR and the rest of the smog equipment...the car ran smoother and stronger. The cleaner appearing engine bay was a bonus.

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Re: Emission control stuff gone (7/11)
1/3/15 10:59am

Sarge81

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WEST SENECA, NY - USA

Vette(s):
1981 Blue Ice Met. w/pearl ghost flames TKO500 5speed. LS1 Swap 3.45 Dana 44.

Joined: 12/3/2001
Posts: 2379

I agree with the above posters...no rules or laws like we have here in the Republik of Amerika.Ditch it.

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GEN III 5.7L "LS6" Engine swap
TKO500 5 spd.

3.54 Dana 44

'69 "N11" Sidepipes
Borgeson Steering Box
Born 8/1981
Sequence #3975

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Re: Emission control stuff gone (8/11)
1/5/15 12:43pm

JMB
Former Member
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Cohasset, MA - USA

Vette(s):
1968 coupe bought in 1999, 2nd owner, 427 custom built, 4 speed (M20), 3:36 posi rear end, Recaro seats, Intro wheels, Nitto tires, Flowmasters, etc. Painted nite race metallic blue.

Joined: 1/5/2004
Posts: 36

Adams' Apple said: If you're not trying to keep the car original, and your laws don't require any of it, I say "Good Riddance"!! Wink

That crap won't actually help performance at all.

I agree.

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Re: Emission control stuff gone (9/11)
4/28/21 6:39pm

eusurp
Former Member
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Jaffrey, NH - USA

Vette(s):
1980 T Top Maroon 350 Corvette

Joined: 4/28/2021
Posts: 1

I have emissions/vacuum question. With so much vacuum operated stuff---dampers---headlights...whatever on my 80 C3...will removing the emission stuff affect those operations at all? I put a block off plate on the EGR and assume I ahve to jsut plug the vac lines that are associated with that...air pump....other vac parts? HUH??? Quite a few lines to terminate or fully remove/plug/ reroute....what manual do you reference for that stuff?

Thanks in advance....rear emergency brake rebuild was a snap compared to replacing the heater core and blower....yikes!!

Soup

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Re: Emission control stuff gone (10/11)
4/3/22 6:29pm

1981vetteguy
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Strykersville, NY - USA

Vette(s):
1981 corvette

Joined: 3/27/2022
Posts: 5

Does anyone have any idea what each of the vacuum ports do on the front of an 81 carburetor are? I’m trying to figure out what needs to be plugged and capped on the system.

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Re: Emission control stuff gone (11/11)
4/4/22 12:00pm

F4Gary
Standard Member
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Grapevine, TX - USA

Vette(s):
1972 LT-1 convertible with factory air.

Joined: 8/26/2006
Posts: 1361

I don't know much about the 81 other than the complicated electronic carb but if you are removing all the emissions junk then all you really need is vacuum to the distributor advance and any PCV hookups. Usually the power brake booster and the vacuum for the HVAC/Headlight doors comes off the intake manifold.

You could probably could just plug the rest of the ports.

|UPDATED|4/4/2022 10:00:42 AM (AZT)|/UPDATED|

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