Decode Carb. on my 71

[Ralph A.]

My 1971 has a Rochester carb on it.I would like to determine if it is original or a replacement.
7041206
Here is what I have found
70
4 - 1970-75
1 - 71
2 - Quadrajet (4 bbl)
0 - Division. 0, 1, and 2 all indicate Chevrolet
6 - Automatic

The judging manual calls for a 7041212
Is there any way this couls be incorrect? What car did my carb come off of?
Any information would be appreciated.
Thanks
RA

[Bill Clupper]

Re: Decode Carb. on my 71

'71 Chevy and GMC pickup trucks with 400 CI engine.

[Ralph A.]

Re: Decode Carb. on my 71

Thanks, is that chevy PU and GMC PU. Does that mean I have a pickup truck carb......any increased HP...haha
Can this information be found on the web. I could not find a definate description for digits 6 and 7.
Thanks again
Ralph

[Bill Clupper]

Re: Decode Carb. on my 71

Not that I am aware of. It is available in repair and interchange manuals, as well as old sales catalogs.

[Ralph A.]

Re: Decode Carb. on my 71 (additional info needed)

Thanks, you were unclear, is the carb from a pickup? CHEVY or GMC?
Need to record this in my fact book for the car.

[Bill Clupper]

Re: Decode Carb. on my 71 (additional info needed)

Both Chevy and GMC pickups and vans used the same engine packages, so it is not possible to determine which.

[Ralph A.]

Thanks for all the info

Thanks

[Bill Clippinger]

Re: Decode Carb. on my 71

Ralph:

My Rochester info states about the same as what Bill Clupper was telling you. My book states that carb 7041206 came on 1971 20 and 30 series pickups (3/4 and 1 ton, not 1/2 ton) with a 402 engine. It doesn't say whether that was a big block or small block 402. Oddly, my book lists 68 thru 73 as Chevrolet, while 73 and 74 are listed as "Chevrolet and GMC." Since there is no specific info for 68-73 GMC, I'll assume that the 71 info applies to both truck lines.

Thanks for the breakdown of the Rochester code. You taught ME something!

BTW, the same book shows 7041212 as a Corvette with auto trans.

[Ralph A.]

Re: Decode Carb. on my 71 (found a dosument)

Found this document on the web. List all Rochester numbers.

http://www.teufert.net/carbs/4-barrel.htm