help with carb identification

72GACRZR · 05-04-2005, 05:47 PM

I have a '72 base 350/200hp auto, in the book "Corvette Restoration Guide 1968-1982 by Richard Prince, he lists two Rochester MV4s for this application.

350/200, automatic 7042202

350/200, automatic with NB2 7042902

The NB2 stands for Exhaust Emission Control option.

My question is, What is the NB2 option( I can not find any other information on it in the book) and how do I know if my car had it if I don't have a build sheet etc? I don't know which carb to look for.

Thanks for the help

gq82 · 05-05-2005, 12:34 AM

The NB2 option refers to base engine cars equipt with an air injection pump or smog pump. This was standard on all LT1's and 454 b/b's. It was only installed on base engine cars delivered for sale in California. So if you own a CA car you would have an air pump and carb # 7042903 (4sp) or 7042902 (auto).

If you do not have a Ca car then you would not have an air pump and you should have carb # 7042203 (4sp) or 7042202 (auto).

Hope this helps.

JohnZ · 05-05-2005, 02:23 PM

If the suffix on your pad stamp is "CKX", it didn't have NB2; if the suffix is "CDJ", it originally had NB2.

72GACRZR · 05-06-2005, 12:00 PM

Thanks guys, I have an automatic GA car. The POP was with it and shows it was delivered to a customer in Augusta, Ga on 12/27/71. I don't have the correct carb and saw a 7042902 on Ebay. Check item 7972098475 before 5/9/05.

gq82 · 05-06-2005, 08:00 PM

I'd pass on that one.....Not correct for your car and even if it were it's only value would be as a core.