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Dean Oliver · 03-14-2014, 01:58 PM

This is one of the questions that I am asked most often. I have built and tested many 207s, but I have honestly never seen any advantage or disadvantage to them. At one point, I called the person in charge of carburetor production at Magnetti Marelli, and asked him if there was ever anything special done for the production of a 7029207 Q-jet. He said there was not, and that they were produced using the same molds and assembled using the same assembly lines as the other Q-jets. Different number Q-jets may receive different jetting, needle/seat, etc. according to the intended application, but the air flow potential would be the same for all. He also had the same comment for the Edelbrock Q-jets - same molds, same assembly lines, just different "settings".

I believe that the whole mystery behind the 207 in class racing developed years ago when no one knew how to modify a Q-jet for racing like we do today. With limited knowledge, most racers ran their carbs pretty much right out of the box with very limited tuning. But you could go down to the local parts store, order a Q-jet for a '69 Vette, and it happened to already have the big needle/seat, richer jetting, wider air valve opening, etc. And since it also came off of a Vette, the legend began.

Now Q-jets are modified well beyond a stock 207 set up, but its reputation continues to this day. The 207 carb is legal for any small primary Q-jet combination, but again, offers no advantage or disadvantage with today's "technology". If it did, I assure you that I would have one on both of our stockers. There's nothing wrong with building one if that's just what you want, but you will be competing with the Corvette restoration guys on price.

Dean

03-14-2014, 01:58 PM	#6
Dean Oliver Junior Member Join Date: May 2002 Location: Stuttgart, AR Posts: 53 Likes: 1 Liked 0 Times in 0 Posts	Re: 207 carb? This is one of the questions that I am asked most often. I have built and tested many 207s, but I have honestly never seen any advantage or disadvantage to them. At one point, I called the person in charge of carburetor production at Magnetti Marelli, and asked him if there was ever anything special done for the production of a 7029207 Q-jet. He said there was not, and that they were produced using the same molds and assembled using the same assembly lines as the other Q-jets. Different number Q-jets may receive different jetting, needle/seat, etc. according to the intended application, but the air flow potential would be the same for all. He also had the same comment for the Edelbrock Q-jets - same molds, same assembly lines, just different "settings". I believe that the whole mystery behind the 207 in class racing developed years ago when no one knew how to modify a Q-jet for racing like we do today. With limited knowledge, most racers ran their carbs pretty much right out of the box with very limited tuning. But you could go down to the local parts store, order a Q-jet for a '69 Vette, and it happened to already have the big needle/seat, richer jetting, wider air valve opening, etc. And since it also came off of a Vette, the legend began. Now Q-jets are modified well beyond a stock 207 set up, but its reputation continues to this day. The 207 carb is legal for any small primary Q-jet combination, but again, offers no advantage or disadvantage with today's "technology". If it did, I assure you that I would have one on both of our stockers. There's nothing wrong with building one if that's just what you want, but you will be competing with the Corvette restoration guys on price. Dean