General Category > Quadrajet Carb Talk and Tips

Plug in air horn directly over APT

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Dave57:
Working on my 1980 Vette #17080228 carb. I am modding per #2 recipe and in the process of reassembling with a Cliff's gasket kit. There is a aluminum plug in my air horn directly over the APT adjuster screw. Can this be removed permanently, or will I have to remove the air horn to make APT adjustments? Also, can I shorten the acell pump shaft 1/8" on 1980 kit? I read somewhere that they were already shorter than early ones. Dave

429bbf:
not sure on shortening the shaft  but knock the plug out and tap to 3/8 don't go to deep and install a 3/8 allen plug . that way you can adjust the apt without taking the carb . tap it just far enough so the top is flush so the gasket seal the dirt with the air cleaner. 3/8 bolt thread not pipe course i think its 16threads per inch. fwiw

Dave57:
Got the hole tapped for a set screw. Still wondering about shortening the accelerator pump shaft about an 1/8".

Cliff Ruggles:
Why would you want to shorten the pump?......Cliff

Dave57:
My motor is a 383 CI ~ 425HP. I enlarged accel discharge holes to .030" per recipe #2. Years ago I was lead to believe that shortening the acell pump shaft would increase the volume of the shot by raising the start point of the pump.

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