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06-11-2013, 07:06 PM
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#1 |
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Registered User
Join Date: Dec 2008
Location: Las Vegas, NV
Posts: 810
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1977 inline 6 vs. california emissions
I should be taking delivery on a 1977 250 inline 6 shortbed stepside here soon.
I know it's not emissions exempt in CA, ......anyone know how clean these motors typically run? from the one engine pic i have it looks like it might be equipped with federal emissions which I believe for that model year was the same as california emissions. I plan to do all the normal maintenance, plug wires, plugs, oil, filter, fuel filter, air filter, pcv valve, any water or vacuum hoses, etc etc. If it doesn't pass smog what are the typical culprits? where would you start? thanks for the help 
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1983 Chevy C10 250/3spd (current project truck) 1976 Chevy C10 350/350 Heavy Half (future project truck) |
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06-11-2013, 07:13 PM
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#2 |
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Registered User
Join Date: Dec 2012
Location: Temple City
Posts: 3,628
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Re: 1977 inline 6 vs. california emissions
If it doesn't pass rebuild carb even when really warm. Then I would be suspect of the cat if equipped.
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06-11-2013, 07:24 PM
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#3 |
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Registered User
Join Date: Dec 2008
Location: Las Vegas, NV
Posts: 810
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Re: 1977 inline 6 vs. california emissions
I believe this is the correct emissions layout:
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1983 Chevy C10 250/3spd (current project truck) 1976 Chevy C10 350/350 Heavy Half (future project truck) |
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06-11-2013, 10:23 PM
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#4 |
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At the body shop.
Join Date: Aug 2009
Location: Land of fruits and nuts.
Posts: 5,254
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Re: 1977 inline 6 vs. california emissions
Depending on gvwr it may not have a Catalytic converter.
Posted via Mobile Device
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" That didnt make it any newer " " Dont antique the equipment " |
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06-12-2013, 12:09 AM
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#5 |
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Registered User
Join Date: Dec 2008
Location: Las Vegas, NV
Posts: 810
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Re: 1977 inline 6 vs. california emissions
I think he said it did have cat.....
slight change of topic: how can I tell what state it was originally built for?
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1983 Chevy C10 250/3spd (current project truck) 1976 Chevy C10 350/350 Heavy Half (future project truck) |
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06-12-2013, 12:34 AM
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#6 |
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At the body shop.
Join Date: Aug 2009
Location: Land of fruits and nuts.
Posts: 5,254
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Re: 1977 inline 6 vs. california emissions
If the emissions label is on the core support. Not usually but maybe.
Posted via Mobile Device
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" That didnt make it any newer " " Dont antique the equipment " |
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06-12-2013, 06:34 AM
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#7 |
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Registered User
Join Date: Feb 2007
Location: Memphis MI
Posts: 1,851
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Re: 1977 inline 6 vs. california emissions
They also like to suck oil. Clean / replace the PVC and hose just before the test. Assuming it's an integral head 1bbl, make sure the choke kicks off al the way, and check for cracks on the intake portion of the head.
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1987 2 ton  1982 250/TH350 beater in progressDad's 1981 3/4 L6 3 on tree posi and no options, awaiting restoration or scrappingPlus a mess o' tractors |
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06-12-2013, 11:37 AM
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#8 | |
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Registered User
Join Date: Dec 2008
Location: Las Vegas, NV
Posts: 810
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Re: 1977 inline 6 vs. california emissions
Quote:
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1983 Chevy C10 250/3spd (current project truck) 1976 Chevy C10 350/350 Heavy Half (future project truck) |
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06-12-2013, 11:41 AM
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#9 | |
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Registered User
Join Date: Dec 2008
Location: Las Vegas, NV
Posts: 810
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Re: 1977 inline 6 vs. california emissions
Quote:
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1983 Chevy C10 250/3spd (current project truck) 1976 Chevy C10 350/350 Heavy Half (future project truck) |
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