c30, how to pass California emissions
hello,
I bought a sweet 1979 C30 dually last month when i visited my dad in Colorado. I'd like to have it here with me in California. It has a 454 with an Edelbrock carbs and headers, and an aftermarket round air cleaner. I know the C30 had no catalytic converter in 1979, so I imagine I won't need those... ...but what will I need to pass SMOG in California? Will I have to replace the headers with factory manifolds, or get a stock air cleaner, etc? I read a lot and couldn't quite figure it out, so I'm hoping some of you know. Thanks |
Re: c30, how to pass California emissions
You likely have a 49 state model.
So you will need a copy of what your engine came from the factory with. Which to me would be a q-jet, and evaporative emissions minimum. |
Re: c30, how to pass California emissions
Is there a smog sticker under the hood showing all the required smog equipment and the vacuum hose routing? That would be a good start. You will have to show the headers are smog legal. CARB issues E.O. numbers for parts that are smog legal.
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Re: c30, how to pass California emissions
:) oh wow, I hadn't really thought I'd need to switch the carburetor back to quadrajet.
On my '69 GMC I rebuilt the quadrajet 3 times in a year and finally gave up and put a Demon 625 cfm on the 350 motor and it runs like new, maybe better... ... so I'm a little quadrajet-phobic. :) So, some CARB approved headers might pass, these are probably not those, hmm OK, so do you know what all EVAP includes? :) I haven't seen any stickers under the hood, any thoughts where under the hood to look? Thanks Oh, ya, where would I find the info on what it was built with? Thanks again |
Re: c30, how to pass California emissions
Have you talked with the DMV that you will be dealing with?
Before you spend any money , Just a suggestion.;) |
Re: c30, how to pass California emissions
Interesting idea, I would like to know exactly what they require before spending money and doing work that might actually lower my mpg's and power.
Maybe a SMOG station could tell me too what they would be looking for. I also wondered if medium duty (about 6,001 to 13,999 gvw) trucks get treated differently... ... because I see mention of vehicles under 6,000gvw and over 14,000 gvw, but can't find anything on vehicles in the middle. Does anybody know? Thanks |
Re: c30, how to pass California emissions
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Get the model number of the current carb and check for CARB certification. The SPID should have an emissions package code. |
Re: c30, how to pass California emissions
Did a quick search and found this, https://www.gmheritagecenter.com/doc...olet-Truck.pdf Go to page 142 and start reading that. This states what's required for as far as smog equipment for both CA and federal trucks.
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Re: c30, how to pass California emissions
1979 with Heavy-Duty Emissions would the Factory air cleaner with the stove pipe running up from the right-side exhaust manifold for the "heated air" to the carb along with a butterfly valve in the exhaust on the right side to aid in faster warm up (EFE). It would also have the AIR (Air Injector Reactor) system pumping air into the exhaust manifolds and would also have the vapor canister system. There would also be a Vacuum Control Switch on the thermostat outlet to control vacuum advance to the distributor. NO EGR or CONVERTER (but I think all that other stuff was more than enough!)
The Emission Control Sticker mentioned above would have been attached to the air cleaner on Heavy Duty Emissions vehicles (over 8,500 GVW) - without the original air cleaner, you will have to search to find one of those stickers that will not only show the Emission Controls, but also the vacuum routing and tune-up specs. |
Re: c30, how to pass California emissions
Wow Rickysnickers and THI, this is great info!
I'll read through it, sounds like I basically need everything on the list for the higher GVW... ... and a stock air cleaner too. Any thoughts on whether I could run all that other stuff from the Edelbrock carb, or would I need a quarajet as well? :) thanks, it is all getting much clearer |
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Re: c30, how to pass California emissions
I have not lived in CA since the mid 1980's, but if I recall you need to have a sticker under the hood for aftermarket equipment that has a CARB exemption (or whatever they call it). I was aware of the pollution equipment that came on a 1979 1-ton because I have owned a 1979 C20 Suburban with a 454 (8,200 GVW) and my 1979 C3500 (10,000 GVW) and knew the HD emissions in that year changed to "over 8,500 GVW". In 1980 they bumped the GVW of the HD 3/4-ton vehicles to 8,600 GVW so they were over the 8,500 threshold. The list Rickysnickers pointed out reminded me of what all came on the "over 8,500" - I remembered the AIR, and lack of EGR and converter, Other systems were pretty much standard since 1970
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I have an 83 K3500 which would have basically the same emissions as yours. I do however have the CA emissions so they may differ that way. I have a knack for building the quadrajets so I rebuilt mine and you’ll likely need it as I think the edelbrock is a 600 cfm and no longer made? I have the only smog legal set of headers for these trucks I am aware of, they’re by Hedman. And even then you’ll have to weld a little pipe on them for the hot air feed to the air cleaner. Mine had to have the a.i.r. Provisions for the smog pump. Maybe there’s more options if yours doesn’t require that. My air cleaner had my emissions diagram, that’d be a good way to figure out what all is required. At least we don’t have cats on these 1 tons, but there’s a lot of other things. Here is the sticker from mine.
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Re: c30, how to pass California emissions
Thanks, that's a helpful picture Zachary.
Could you possibly also post pictures of these actual things on the engine so I can visualize what these parts are and see if I'm missing major components and brackets and such. Thanks :) |
Re: c30, how to pass California emissions
I should be getting it back from the body shop in the next week or two, I’ll do what I can then! I don’t have any existing ones that will help too much
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Re: c30, how to pass California emissions
That would be awesome Zachary, thank you.
:) |
Re: c30, how to pass California emissions
I wish I had the original air cleaner to my 1979 C3500 but it was long gone and replaced with an open element by the time I purchased. My 1978 C20 has the original air cleaner, but the 1978 came with a whole lot less pollution equipment - no canister, no EFE - basically a PCV, hot air to the air cleaner and spark control (Spark TVS). According to the GM reference above, CA and Fed came with the same equipment for HD emissions (over 8,500 GVW in 1979 so the picture for the diagram above would be correct.
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Re: c30, how to pass California emissions
I actually have another, though unrelated, question...
... in 1979 is it a C30 or a C3500... ... for some reason I thought I have a C30, but the owners old registration says C35. Do you know? :) |
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Re: c30, how to pass California emissions
GMC is C3500
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Re: c30, how to pass California emissions
It is definitely a Chevy C30, they must have just messed up at the DMV
:) On the emissions stuff, does this all mean that I will need to get all that emissions stuff, including an original air cleaner, with a sticker on it, specifically from a 1979 with a 454 and a GVW over 8600? I guess I better start calling junk yards |
Re: c30, how to pass California emissions
can you register it as a classic ???/ dont knw if it needs emission ????
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Re: c30, how to pass California emissions
Just curious. Is the truck checked to make sure it has all the original equipment on it? Or do they just test your exhaust to make sure it doesn’t put out more emissions than a factory 79’ would put out. I only ask because what if the truck had been swapped to an LS or something fuel injected? It could put out less emissions than a factory 79’ with a 454. Would it still pass?
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Re: c30, how to pass California emissions
It needs all the original smog equipment it came equipped with. There's a check list the tech goes through. If you swap to a later engine, you still need all the smog equipment for that particular engine, and then you have to go to a BAR referee. He/she will test your vehicle and place a sticker on it. This lets any future smog tech know the engine has been approved and tested by said referee.
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Re: c30, how to pass California emissions
Wow okay. That’s quite the process.
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