Quadrajet Problem Solving > Quadrajet Parts and Numbers

17059284

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Cliff Ruggles:
Is it the large main airbleed model, with the APT system in front of the power piston?......Cliff

passthebuck:
I don't think I have the adjustable APT on there & I have yet to receive your book (Canadian mail is slooow) so I'm still not sure what I'm looking for but I took some photos to see if you can see. Ignore that spacer for my air cleaner nut I have resting on the stud so I don't loose it... Thank you again for your help. I have more photos - just ask!

Cliff Ruggles:
That carb will have an APT system.  Remove the air filter gasket, and look for an aluminum plug directly in front of the choke housing, under the gasket......Cilff

passthebuck:
Cliff,

There is the alum plug.  Insert embarrassed face here...

Cliff Ruggles:
Good news.  I would replace it with a 3/8" set screw so you can remove the plug and make adjustments without taking the airhorn off the carburetor or leaving the plug out.

You may not have enough control with the current jet/rod set-up.  The carb is a large main airbleed model.  We typically install smaller MAB's in them, and recalibrate with a better jet/rod set-up.....Cliff

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