Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor
edelbrock 1904
Cliff Ruggles:
Most of the later carbs use the tamper proof screws with a double "D" head. Some had a very small hex head but somewhat rare.
If you have a flex tool for the stock type screws they work much better to set the mixture screws than a screwdriver.
The hex head variety are also easier to adjust as you can use a nut driver with a universal wrapped with electrical tape so it doesn't flop around so much.....
dwelch:
i have about a half dozen spare and parts q-jets. are the mixture screws the same if i have a spare set from one of my parts carbs with the hex head? i'll follow up with how this distributor set up works with the edelbrock 1904. thanks for your help. ps it's been about three years since i put this carb on and i like to freshen them up every now and then. i'll call around thanksgiving for a kit.
77cruiser:
You'll have to compare the threads. Late carbs had fine metric & others were 10-32. Easy to tell when side by side.
dwelch:
thanks for the reply. i'll check my supply this weekend.
Cliff Ruggles:
1979 and later units (17059XXX and 17080XXX) will use fine pitch metric threaded idle mixture screws.
The hex head versions are pretty rare, most are the double "D" variety, and they require a very thin wall deep well socket or special tool to access and turn them......Cliff
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