twinpack

I am restoring a early 68 (Build date Oct. 67). It's a L79 car with a Holley Carb. So I was hunting an researching the correct carb. The specs I found say it should be a Rochester Quadrajet #7028219 DG. Looking at the specs it says this carb is Non-A.I.R. but correct for the car. The #703 prefix is with A.I.R. As I was reading a restoration reference it stated all cars had A.I.R. Know mine is pretty much all original with the exhaust manifold with no air tube connections. The book I am referring to is Corvette 1968-1982 Restoration Guide by Richard Prince. I have found incorrect information already in this book that other CF members have verified as being incorrect. Any input?

twinpack

Ttt

PRNDL

Every authoritative source I have ever seen says that every single 1968 model year corvette had the AIR system, including L-88s. I am sure there are some original owners that will claim their 68 never had it, and come up with a scenario that the guys on shift #2 took an extra break that day and had one too many beers and "forgot" to install the AIR, but hey, anything is possible. As for the correct carb#, would have to look it up.

twinpack

This was my thoughts. However after looking up the application it say no A.I.R. My code #7028219 as you can see prefix 703 with A.I.R. 702 no.
Prefix code. "70" will appear on all late '60's Rochester Carburetors.
76 and later will start with "170"
2 - Decade produced.
702 - 1960's
703 - 1060's with A.I.R.
704 - 1970-1975
1705 - 1976-1979
1708 - 1980's

vettebuyer6369

According to the 68-69 NCRS Technical Informational Manual & Judging guide:

- "ALL 1968 (and 69) Corvettes were equipped with AIR."

I have found this to be consistently true, and generally its the type with the relief valve on the top.

-1968 carb listing shows 327/350 4 spd as #7028219 DG" Rochester, not Holley.

Black Book also confirms the 8219 Rochester for the 350 hp car.

I believe whatever reference you are using for "non-AIR" is incorrect.

It is interesting that your exhaust manifolds don't have the inlets. Is the upper small bracket in place on your block for the smog pump? A lot of people leave it on when they take the pump off.

You should post this question on the NCRS board, but I think the car should have an 8219 carb and AIR pump.

twinpack

I may e-mail NCRS. The issue: I have a chart, copy wright 1968 and agrees with other references that the 1968 L79 option has a 7028219 Rochester carb. In the Rocherster coding the 702 prefix is non-A.I.R. the 703 prefix is A.I.R. This is my confusion.

Mike Ward

All Qjets used in '68-'69 Corvettes started with a 702xxxx part number, (no 703xxxx) so I think your carb reference is incorrect.

Dick Whittington

ALL 1968's had A.I.R. I have looked at a lot of '68 cars over the last 30 years and have NEVER seen an original car without A.I.R. The manual that all the Emission Inspection stations go by says that they were all equipped. I do not know your source of info, but it is dead wrong.

joewill

check your exhaust manifolds. you may think they are original, but they may not be. they should have air inlets. check the casting numbers and date codes. so many of them look the same until you break down the numbers and dates,

Easy Mike

All 68s had AIR. Correct carburetor for the L-79 is 7028219.

avalonjohn

As all have indicated, the correct carb for the 68 L79 is the 7028219 DG. NOW, the hard part is finding an original one. VERY VERY expensive. Be patient.

Also, BEWARE of some of the ones on Ebay. There is a group out of the west (Arizona and California, actually I think it is the same company) who is listing hard to find carbs like this. Most are fake restamps. Be prepared to spend some serious cash for an original if you are in a rush. I do know a guy in New Jersey who rebuilds for many major suppliers. If anyone has one, he will but rest assured it will be original.

Mike Ward

The OP must also add the costs of a complete, correctly dated smog set up, plus correct exhaust manifolds. Ouch.

bobbarry

In fact, there were no Rochester carburetors starting with 7038xxx or 7039xxx; 1967 was the last year for the 703xxxx-coded carburetors (Reference: AC-Delco 9C Bulletin- Index, May 1985, p. 5)