Quadrajet Problem Solving > Quadrajet Parts and Numbers

7041208 fast idle cam

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D Denzin:
I looked at some other qjets of approx the same vintage heres what I came up with.
in ref to Ethans picture with the 2 yellow arrows.

The arrow on the left, that arm on the linkage looks right, that arm prevents secondary air flaps from opening with choke on.

The arrow on the right. to me it looks af the arm has been modified. the end of the arm should be straight (horizontal) not bent up 90 deg. that arm is supposed to go thru the plate and under the plastic cam. So when the thermo coil is pulling down (cold) the plastic cam goes onto different idle speed steps and the arm on the left blocks the linkage to the secondary air flaps from opening.

I hope I'm right on this, its late in the night, and I'm no expert by any means. Just trying to help.

70quad:
Time to check in on this. My thoughts are that the throttle plate & bowl are correct for '71, but the entire bracket/fast idle/choke pull-off are from some other carb(it does all work correctly though). Also the air horn(#7037307) has an external vent valve, which I don't think would be present on a 1971 Quadrajet, or could it be? I'm thinking that this carb was thrown together with spare parts. - Dale

70quad:
Finally got around to looking at this carb again. The external idle vent valve question still hasn't been resolved. Can anyone confirm if a mid '71 carb would have an air horn with one or not? I always thought that 1970 was the last year, but ????? Thanks, Dale.

Ethan1:

--- Quote from: 70quad on October 25, 2014, 04:10:54 PM ---Finally got around to looking at this carb again. The external idle vent valve question still hasn't been resolved. Can anyone confirm if a mid '71 carb would have an air horn with one or not? I always thought that 1970 was the last year, but ????? Thanks, Dale.

--- End quote ---

 I believe you are correct. I think the air horn had been replaced some time in its life.

Ethan1:
 Also, I think it lasted from '67-'70 in BOP. Not sure in Chevrolets. ;)

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