BStone

Thanks!

MDchanic

It's a pump that blows air (oxygen) into the exhaust manifolds to burn off a bit of excess pollutants while the gasses are hot.

- Eric

BStone

Thanks Eric. I noticed there ia a Quadrajet carb on Ebay that says it has A.I.R.

So were these carbs different than any of the other quadrajets? eg a quadrajet with CCC?

Lady72nRob71

A CCC (computer controlled) carb is is totally different than a non-ccc one - use a ccc carb on a computer controlled car ONLY!
Now a CCC carb usually had the AIR system attached to its engine also.

A NON-CCC carb may have or have not been used with AIR and or EGR, depending on the year, model, and location of market. If the carb was used with an AIR or EGR system, then the jetting and adjustments would be different to compensate.

Buyer beware when getting stuff from flea bay - do your research on your own before you buy to make sure it will work with your application. Many sellers are clueless to what they have and do not know much about its compatibility and application. Also, do not expect any warranty unless you are dealing with a reputable company rather than an individual.

Olds Dad

Don't buy if you're using on a non computer car - things like the metering rods are electronically controlled and won't work properly on a non computer car - plenty (probably more) of regular Q-jets around to steer clear of this one.

If it is a computer carb you're looking for, be careful too - even 'rebuilt' ones are suspect...these were tempermental at best once they'd been cracked open - you need someone who is very familiar with their nuances if replacing or rebuilding one.

rocketraider

We're not talking about computer carbs (correctly called C3 or C4, not CCC). We are talking about a carb calibrated for use with the early smog pump systems. They were jetted a little leaner with different power piston and secondary metering rod hanger curves.

CCC in this discussion refers to the 1967 Climatic Combustion Control System, which BStone's 67 Delta has. Those carbs were also calibrated a little leaner.

Keep in mind that except for California emissions cars, Olds did not use smog pumps until the 1980s, and probably wouldn't have then except for the Feds wanting them on all gasoline engines irregardless of whether they could pass emission tests without them.

Olds Dad

Ahhh....now I see

Ignore that Olds Dad guy - he's an idiot.

BStone

Looked at the difference between the CCC vs AIR carbs and the jetting all seems the same.

Year & Application Carb # Main Jet Primary Rod Secondary Rod

400/425 w/ A.I.R. 7027157 7031971 7031845- "45" 7033655- "AU"
400/425 w/ C.C.C. 7027032 7031971 7031845- "45" 7033655- "AU"