409/409

In 1975, were L-82's exempt from smog pumps and catalytic converters except California cars?
Thanks.

409/409

Anyone???

Easy Mike

All 75s had the catcon. The L-82 probably had AIR. The L-82 may not have been available in California for 75.

Tooch1

There has been some confusion over this. NCRS Judging Guides and other restoration manuals say that all 74-77's came with the AIR system except the L48's with the automatic tranny. Yet, some NCRS gurus are positive all 75's came with A.I.R system. All 75's did come with the CAT.Converter.
At least I hope this answers your question about the L82. Yes it should have a smog system on it.
If you google the question, you'll be able to read some of the NCRS forum responses on this topic.
Regards,
Jim

530planeman

I had a 75 all original with L48 it had A.I.R and cat was an automatic coming down a long down grade you could smell the passenger carpet melting
Wes

gbvette62

Starting in 1975, every new car sold in the US, came with a catalytic converter. The use of A.I.R. pumps, varied by make, model and engine.

75 L-82 Corvettes came with both a cat and an A.I.R. pump. In fact, the 75 sales brochure has an illustration in it, showing an L-82 engine with the A.I.R. pump installed on it.

There were no restrictions on engine options for California in 75. This was likely because the cat cleaned the exhaust enough, that the L-82 still met California's stricter emission levels. 75 was the last year that the L-82 was available in California.

jdenn47

Is there any reason that you should not remove the A.I.R. pump?
My 75 has one. L48

derekderek

since you are in PA, maybe. you are one of the few that get emissions inspected on 75's. do not ditch your cat! true duals with aftermarket cats of maybe scare up 2 OE cats from a caravan or similar may improve performance while also improving emissions.













oe 75 cat is trash. expensive scrap value but jnk.

Mod75

My early 75 L48 had AIR pump and cat, yes that's all gone.

grady white

75 first year of the cat .. L48 and L82 California still does smog test to this day and you must have all pollution pumps and heat riser on the car . Figures 🤣

carriljc

SMOG TEST NOT TRUE FOR 1975.
https://www.dmv.ca.gov/portal/vehicl...g-inspections/

Your vehicledoes not need a smog inspection if your:

Gasoline-powered vehicle is a 1975 year model or older (This includes motorcycles and trailers.) Diesel-powered vehicle is a 1997 and older year model OR with a Gross Vehicle Weight of more than 14,000 pounds.

jdenn47

Can you remove it without any issues and does it rob HP?

Mr D.

If you have a working AIR system than leave it alone, the HP required to turn the pump is N/A as you the driver would not notice any performance difference with it on or off the car.

Paul Borowski

...I believe EVERY '75 Corvette came with an A.I.R. pump, but many have argued that they have low mileage original cars and their's never came with one blah, blah, blah. 1975 & 1976 Corvettes were the easiest to make look like it never had a smog pump as it DID NOT have the typical A.I.R. exhaust manifold "trees". '75 & '76 had a single rubber hose coming off of the smog pump to a pipe connection just below the heat riser. So it was easy to make it look like it never had a smog pump once you removed it. They used exhaust manifolds exactly like a '74 L-48 automatic Federal Emission car which never, ever came with a smog pump so the exhaust manifolds won't have a place where the A.I.R. trees attached to. I've looked at a ton of 1975 Corvettes and if it wasn't all "redone or modified" and mostly original or survivorish, I could tell there once was an A.I.R. pump on it. The NCRS Guidelines "used" to say that "maybe" some did not come with an A.I.R. pump. In the last year or two, it has been revised to say ALL 1975 Corvettes came with an A.I.R. pump. On all the cars I looked at, it was plain as day on the emission sticker that says "EFE, AIR, EGR, OC EXHAUST". Right there says it all.

grady white

ALL 75’s came with air pumps etc …this is my unmolested all original 75 with 10k on her

kdf1986

Hello
I am joining in on this also to confirm that my 75 L82 has the A.I.R. pump and a catalytic converter installed.
kdf

jdenn47

What steps do you need to do to remove the AIR pump? Does it rob HP on a L48?