What headers for a Ca smog car?
Thread Starter
Race Director
Joined: Apr 2007
Posts: 14,062
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From: Henderson Nv-Rohnert Park/Sonoma C o. ca/born in NY Rockaway Beach.
What headers for a Ca smog car?
Ok im thinking about getting a set of headers now......Ill want to do it in the winter while im having my carb rebuilt.
Anyone know of a good set for my 350..needs to be smoged.
Anyone know of a good set for my 350..needs to be smoged.
Burning Brakes
Joined: Feb 2003
Posts: 1,128
Likes: 4
From: Upland Ca
What ever headers you buy make sure they come with a CARB (califionia Air Resources Board) sticker certifying they are SMOG legal. Other wise you will fail the visual and never even get to the actual smog test. Been there done that. Also, in order to pass the visual you'll need to route the exhaust through a single cat.
Pro
Joined: Sep 2007
Posts: 735
Likes: 1
From: Harleysville PA
i lived in CA last year and put headers on my 06 Mustang GT. you have to put shorty headers on newer cars (not sure what year this starts) and long-tubes are not legal - freakin tree-huggers
you car will also have to be below a set dB level so be careful what exhaust you put on your car in CA - good luck.
Race Director
Joined: Feb 2005
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[QUOTE=DJordan442;1562283352 you car will also have to be below a set dB level so be careful what exhaust you put on your car in CA - good luck.[/QUOTE]
State DMV code is 95 db for permormance exhaust...my 69 is "borderline"....
,but never an issue...
Rich
State DMV code is 95 db for permormance exhaust...my 69 is "borderline"....
,but never an issue...Rich
Race Director
Joined: Jul 2004
Posts: 12,703
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From: Scottsdale Arizona
The real problem is the 2:1:2 exhaust. The cat is the real bottleneck and you probably won't get all that much from the headers because of this. I think you'll get far more return by getting a high flow cat.
Now comes the hard part. The above assumes that you want to do what is more or less legal. The truth is that depending on how thorough and knowledgable your smog facililty is, you may have far more latitude. As long as your creation can pass a sniffer, you can get away with considerably more BUT, there is always the risk that you'll come across a tester that takes his job seriously.
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Thread Starter
Race Director
Joined: Apr 2007
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From: Henderson Nv-Rohnert Park/Sonoma C o. ca/born in NY Rockaway Beach.
The short answer is, not many. Hedman used to have headers with smog tubes. From a post above, apparently Hooker used to have these as well. I think that both have discontinued them so you'd either have to luck out and find one sitting on the shelf of a speed shop, or go the route of having a set fabricated by adding tubes to the set that you can find with a CARB sticker.
The real problem is the 2:1:2 exhaust. The cat is the real bottleneck and you probably won't get all that much from the headers because of this. I think you'll get far more return by getting a high flow cat.
Now comes the hard part. The above assumes that you want to do what is more or less legal. The truth is that depending on how thorough and knowledgable your smog facililty is, you may have far more latitude. As long as your creation can pass a sniffer, you can get away with considerably more BUT, there is always the risk that you'll come across a tester that takes his job seriously.
The real problem is the 2:1:2 exhaust. The cat is the real bottleneck and you probably won't get all that much from the headers because of this. I think you'll get far more return by getting a high flow cat.
Now comes the hard part. The above assumes that you want to do what is more or less legal. The truth is that depending on how thorough and knowledgable your smog facililty is, you may have far more latitude. As long as your creation can pass a sniffer, you can get away with considerably more BUT, there is always the risk that you'll come across a tester that takes his job seriously.
So your saying that just by getting a low flow cat I can get better HP. ? Im geting ready to have it dynoed for the heck of it and would really just love a few extra HP.
Le Mans Master
Joined: Jan 2001
Posts: 6,741
Likes: 1,383
here you go...
every exhaust system that has been CARB exempted. you can seach via the word "corvette".
Take a look at Executive Order D-167-27...
not sure what year your car is...but if you search for Corvette you'll find all the exemptions.
http://www.arb.ca.gov/msprog/aftermk...rmktdevice.php
Take a look at Executive Order D-167-27...
not sure what year your car is...but if you search for Corvette you'll find all the exemptions.
http://www.arb.ca.gov/msprog/aftermk...rmktdevice.php
Le Mans Master
Joined: Jan 2001
Posts: 6,741
Likes: 1,383
Looks like part number 68301...
is the one with AIR tubes...
this first website actually says they come with AIR tubes....
http://www.sportcompactonly.com/part...08.htm?k=68301
Below is the summit page; I don't know why they say they're not legal in CA if there's an actual exemption for them in the CARB listing. Not only that, but the picture (which is a representation only) doesn't show the AIR holes/tubes.
http://store.summitracing.com/partde...view=32&N=700+
this first website actually says they come with AIR tubes....
http://www.sportcompactonly.com/part...08.htm?k=68301
Below is the summit page; I don't know why they say they're not legal in CA if there's an actual exemption for them in the CARB listing. Not only that, but the picture (which is a representation only) doesn't show the AIR holes/tubes.
http://store.summitracing.com/partde...view=32&N=700+
Le Mans Master
Joined: Oct 2002
Posts: 7,098
Likes: 378
From: Las Vegas - Just stop perpetuating myths please.
Doug Thorley headers.
I have Doug Thorley headers with smog legal tubes but for '74 and earlier. They won't sell for '75 and later due to the single cat/exh pipe on those years. But the quality is great and i have used DT headers before with Air Injection tubes on a late model pickup without any problems/leaks that cheaper headers have. Maybe give DT headers a call to see what will work.
Good Luck,
cardo0
Good Luck,
cardo0
Instructor
Joined: Apr 2007
Posts: 171
Likes: 0
From: Concord ca
I use these on my 78. They act like headers and the pass visual.
http://www.castheads.com/corvette_systems.php#manifolds
http://www.castheads.com/corvette_systems.php#manifolds
Race Director
Joined: Feb 2005
Posts: 16,100
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I use these on my 78. They act like headers and the pass visual.
http://www.castheads.com/corvette_systems.php#manifolds
http://www.castheads.com/corvette_systems.php#manifolds
Advanced
Joined: Dec 2006
Posts: 50
Likes: 1
From: So. Cal. CA
Headers and EFE
One thing you might need to take into account is the EFE. In the picture in the thread below, it's the round silver thing at the bottom of the picture about a third of the way in from the left corner:
http://forums.corvetteforum.com/show...&highlight=efe
If you have it, you need to keep it. I found a couple of threads with some info on headers that allow this, and even part numbers:
http://forums.corvetteforum.com/show...&highlight=efe
http://forums.corvetteforum.com/show...&highlight=efe
Thanks for asking the question! I had looked into headers, and somehow thought because of the EFE, I was out of luck. Now I've found a couple of choices
Mike
http://forums.corvetteforum.com/show...&highlight=efe
If you have it, you need to keep it. I found a couple of threads with some info on headers that allow this, and even part numbers:
http://forums.corvetteforum.com/show...&highlight=efe
http://forums.corvetteforum.com/show...&highlight=efe
Thanks for asking the question! I had looked into headers, and somehow thought because of the EFE, I was out of luck. Now I've found a couple of choices
Mike
