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I recently purchased a 1971, 4sp. Almost everything on it is original. PO put on a Edelbrock carb that I really don't like. In a box was a Rochester carb and he told me it was original. Before I go through the expense and trouble of putting it back on, I want to make sure it is original. I have looked at several sites and I haven't been able to verify. Under the part number 7041202 where the date code is suppose to be is the letters B1 DG. I believe this is a 71 carb, but I am not sure why the other info does not line up with what I find online. Also most sites say the last number notates manual vs auto. This is a manual car and I believe it should be an odd number. Appreciate any assistance.
Jim,
The correct carburetor should be 7041213. Who you should ask is Lars. He is the zen master of Carburetors & Distributors. He would probably tell you who even has one laying around. I have dealt with him many times, he is a legend on the forum.
I don't even have a carb anymore but I read his stuff just to learn things. It's fascinating. He'll be able to tell you the best course of action to take.
You really should e-mail Lars and request his input on your carb. The one you have is intended for a car with automatic transmission. However, if the assembly line ran out of the "correct" part for a car being built, they would use whatever they had, rather than to shut down the assembly line.
In any event, if that is an 'un-modified' Q-jet, it can easily be rebuilt to its original specs OR easily modified to match your engine's needs. Lars will give you the options.
If the Edelbrock has an adapter to mount it to a stock Q-Jet intake......take it off.....just horrible mismatch and distribution. If you show up to the house with this setup, I will not work on your car until it is rectified. From like the middle 80's to like the early 2000's....it was all the rage for the uneducated to rip off their Q-Jet and buy an Edelbrock carb with that miserable adapter.
Never seen this setup without the venturis being pitch black from reversion.......it is just a **** setup and the only reason one should consider it is because you are on the road broke down and need to get home.....
Ok......so send that Q-Jet to Lars and get it worked on......put it on the car.....your "expense" would be minimal compared to most auto repairs.
You will be surprised how well a Q-Jet work when done right......they are really the best street fuel mixer around.....
From: At my Bar drinking and wrenching in Lafayette Colorado
Look closely at the number and the way it's stamped: First of all, the number is stamped the wrong way - look at a corrrect 7041205 here (I dont have a photo of a 7041202 stamp, but the 7041205 stamp is the same):
Then, look at the first "0" in your carb stamping, and compare it to the second "0" in the stamping: One of them is a "zero," and the other one is an "O". Rochester never used 2 different "0" stamps in the same part number:
Your carb is a re-stamp. The textured surfaces show that it's been sandblasted and replated. A commercial rebuild that's been hacked. It is not what it is represented to be - likely pieced together from several different carbs.
Here are some photos of an actual, authentic 7041202. Compare this to what you have:
The reason the Q-Jet is in a box and the car has an EDL carb on it is because that commercially rebuilt Q-Jet in the box doesn't run right, and probably never will. Leave it in the box.
Lars
Qjet really is the best carb if you can find the right one, but if you don't want to wait on finding it and want to have a better carb in the immediate future - the Holley 650 spreadbore works very well also. $.02
Hey Lars,
Greetings from Upstate NY. I think he is looking for a 7041213 carburetor. This carb he has on it now is totally wrong. You have anything laying around in Colorado?
From: At my Bar drinking and wrenching in Lafayette Colorado
The 7041202 carb would run and work great if it was a "real" one that was not tampered with. It is effectively identical to the Vette 7041213: Jetting specs and setup is identical. Unfortunately, from what I can see of the carb with the fake stamp number, I would not recommend using or attempting a rebuild of that particular 202 carb, so searching for a 213 would be a good idea. I don't have any rebuildable 213s in my parts inventory, but the OP would be well advised to not exclude the 202's, 203's, and 212's in his search for a good, rebuildable 1971 carb that would be "visually correct" if a "numbers-matching" setup is not a requirement. Any of these would produce an outstanding level of performance at a reasonable cost: The 202/203 Chevelle carbs are a few bucks cheaper on the used parts market.
Rochester Quadrajet ?
