Quadrajet Problem Solving > Quadrajet Parts and Numbers

7045264

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Kenth:
Unless someone changed to a 1976 or later air horn it should have a brass plug above the APT adjustment.
I have seen it 1.5 - 2.0 turns up from lightly seated.
The idle tubes are .038" in these units.
#62 jets are way too small, i would use at least #70 if not #72 jets with the APT seated and tune from there. The primary rods should have a J or K suffix in 1975  units. Also, the secondary rods are too lean for any kind of performance usage.
And, all Pontiac V8 Quadrajets uses .070" +- .001" lower idle air bleeds.

mcx:
 Kenth...thanks for the info
....it has a brass plug, I was looking for ideas as to what I could use to replace it with something that would be easier to take on and off.
This carb must have been modified as some point, as the APT  /aneroid (not sure the correct term on these one year casting) because that screw was 2 and 3/4  turns from bottom...maybe they were compensating for such a tiny primary jetting (62) ??
Anyhow, I'll change the jetting to your suggestion.

4ever18:
In order to plug the hole and be able to get to the APT easily once the air horn is back on the carb, I tapped the the existing hole for a 3/8" x 24 thread brass allen head plug.   This will sit flush with the air horn and not interfere with the air cleaner.  Be sure to get a shallow (thin) plug, about 5/16, so that it doesn't bottom out on the APT screw.

Hope this helped.

Jay

tayto:
dont tap the hole completely. I use a bottoming tap and leave it untapped @ the bottom so the plug won't screw all the way in

Pav8427:
Hole in air horn is perfect tap size for 1/8 NPT allen plug. Also seals when using NPT.

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