See 1976 Chevrolet pickup with Rochester quadrajet upgrade on SBC 350 V8. We removed the hood, mounted a camera looking down on the air horn, and took it for a spin, running wide open on an uphill grade. See how the secondary air valve responds to rpm drop at each upshift of the THM. Also included is a smoking burnout.

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re-jet your Quadrajet (part 1)
rejetting a quadrajet

The Infamous Quadrajet Moan
Making a full-throttle pull on the chassis Dyno with our 1972 Pontiac Trans Am with 455 H.O. engine.

for Tim - Rochester tips

#1901 Edelbrock Quadrajet Stage "2"
Carburetor Mike's Stage "2" Quadrajet This is my Stage 2 configuration of the Edelbrock Quadrajet #1901. Through trial and error I've dialed in the jetting and circuit timings especially for the Boss Hoss Motorcycle. The baseline Carburetor was a Edelbrock #1901 Quadrajet. It now has many modification which go way beyond a mere jetting change. This combination took a Dyno mounted Alum. 434 Small Block to an output of 485HP. The engine in this video, Is a ZZ4 with a larger than stock cam. Ported and Polished Heads, 1.6 Roller Rockers, Port match intake and headers. Those who have gotten one of these Stage 2 carbs. Report that their Bikes have never run like they do now. They report it has a better all around performance with an extremely sharp and crisp off Idle response, a strong W.O.T. and an increase in fuel mileage, from 4-6 MPG if they take it easy. I also have a combination for the Edelbrock #1910 that are mounted on the 502 cid Big Blocks. As you will see in the video. It is very important to have the choke wired open or a manual control on it, if left disconected the choke will fall in when you open it up. That is why it returned onto the fast idle the one time. These carbs would work well on any Hot Rod that has some gear in them. And with the stock Choke Pull-off they would run great on a stock car or truck as well. carburetor.mike@netzero.com