Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor

which holes to measure???

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429bbf:
cliff would be the one to ask. without knowing all of your specs. (what vehicle,what cam,what engine.gear ratio,manifold,distributor,timing,fuel pressure, and a million other things)its impossible to tell you whats going to work . but i will say I've never used that large of upper idle air bleeds myself but maybe it will work on your combination ..002-.003 on a dcr or idle tube. can make a world of difference on any given engine. also when you get close make very small adjustments and don't do a lot of changes at one time. building a quadrajet  to run perfect is like winning a war .(one small battle at a time )because any change you make effects something else down the line and understanding what that is will make your war a lot easier to win.the most important thing to understand is to get the idle and primary perfect and finish with the secondary. most folks monkey with the secondary to try and fix a problem because its easy. thats the last thing to do. one last thing . in my experience 50 percent of bad running engines that get worked on are NOT THE CARB ,most are distributor problems of some sort.,vacuum leaks ,bad canisters , coils,points,wires,plugs,springs,weights,advance,you name it it will bite you.fwiw

jbh7052:
just to make sure I am understanding what I am reading...sometimes we read what we think it ought to say! the upper air bleed is just above the DCR. It is at about a 45 deg. angle and leads into the venture. my book will probably be here on Monday but I sure like talking to someone first to help me understand what I am seeing!

429bbf:
yes it should be . i don't have that carb in front of me right now. remember some idle air bleeds are in the air horn. if someone else on here has one in front of them or knows for positive please chime in and help out.thats the great thing about this site ,there a lot of folks working on carbs and everybody has different problem. fwiw

429bbf:
just some info on how it works. the idle tubes are all fuel . as the fuel is pulled up from the idle tubes it is mixed with a little air(that comes from the idle air bleeds)then it goes down the dcr and heads to the idle screws if front of carb. which control fuel (not air ) hth

jbh7052:
I am gonna see if I can attach some pictures with drill bits in the correct holes and maybe you can keep me out of hot water. I will post them in just a few minutes. Thanks again for the help! I gave cliff the info and he said to tap the hole for a specific screw and drill to a new smaller size on the upper air bleed. With the angle of the hole I may chicken out!

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