Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor

Quadrajet 7042220 idle air modifications

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Cliff Ruggles:
I use a small punch with a rounded end that I made to shrink down the Lower IAB's and resize them.

I didn't touch the POE system or notch the flaps.  I did leave a tiny bit of slack in the linkage so they "tip-in" slightly when the secondaries open so the fuel from the POE holes runs down under the flaps instead of out on top of them.......

Tway:
So put the carb back together with a new SR kit, after talking to Cliff, I decided to try it before making any further modifications. Had the 454 out of my 72 chevelle built at John and Allyn Armstrong’s and the Qjet worked great in the test cell. Idled fine and no hesitation what so ever. Engine ended up making 492 hp@5500 and 530 Tq @3300.  Be a while before it ends up back in the car.
The bad is I noticed the Qjet inlet threads were weak when I reassembled - wish I had checked that first. So I’ve got a drip and suspect I’ll need to get a Heli coil repair done.

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