Cliff's Quadrajet Parts and Rebuild Kits

General Category => Quadrajet Carb Talk and Tips => Topic started by: mcx on February 14, 2019, 11:31:27 AM

Title: 17059241
Post by: mcx on February 14, 2019, 11:31:27 AM

Cliff...Its my first overhaul of a later version qjet,1979 Buick ....I was also able to remove the idle screw plugs easy enough using a Dremel cutting disk and hammer/chisel, ...my 2 questions.... 1)how large can I drill out the idle screw mixture holes?   2)..Is the idle air bypass only used on one side of these type of carbs? This base plate is only drilled on one side.thx, Mike

Title: Re: 17059241
Post by: Cliff Ruggles on February 15, 2019, 02:34:51 AM

I would not take the mixture screw holes past .089".

The bypass air isn't drilled yet, that hole is for the vacuum advance port......Cliff

Title: Re: 17059241
Post by: mcx on February 15, 2019, 02:05:56 PM

...here is a pic of the base plate and what I think are the idle air bypass...one open and one closed?

Title: Re: 17059241
Post by: Cliff Ruggles on February 16, 2019, 02:15:36 AM

Both are closed.  That hole supplies full manifold vacuum to the port on the drivers side of the main casting.......Cliff

Title: Re: 17059241
Post by: mcx on February 16, 2019, 04:42:32 AM

Cliff..thanks for clarifying what I dont have here, ...any issue with adding a second corresponding hole in that drivers side base plate channel for bypass air?. Adding the passenger side seems fine...Mike

Title: Re: 17059241
Post by: Cliff Ruggles on February 17, 2019, 02:41:46 AM

Add the holes to both sides by drilling down from above in the bypass air channels......no worries.....Cliff