Cliff's Quadrajet Parts and Rebuild Kits

Quadrajet Problem Solving => Dialing in your rebuilt Quadrajet carburetor => Topic started by: Jeff1 on January 16, 2016, 08:26:13 AM

Title: Drilling idle mixture screw opening
Post by: Jeff1 on January 16, 2016, 08:26:13 AM

Could someone explain the proper procedure for drilling the idle mixture passages correctly.  Do I drill completely through tho the primary bore? I red and re red but I'm missing something.   Thanks

Title: Re: Drilling idle mixture screw opening
Post by: 77cruiser on January 16, 2016, 03:01:55 PM

Yup

Title: Re: Drilling idle mixture screw opening
Post by: Jeff1 on January 16, 2016, 03:20:54 PM

So am I missing something or am I correct

Title: Re: Drilling idle mixture screw opening
Post by: blazer74 on January 17, 2016, 04:13:58 AM

Mixture passages as in idle mixture screw holes? If so you are only enlarging the existing holes under the mixture screws after they are removed. Your drill bit will be visible inside  the throttle bore when you drill thru and thats it.

Title: Re: Drilling idle mixture screw opening
Post by: Jeff1 on January 17, 2016, 05:08:19 AM

Thanks Blazer74.  That was the info I needed. I'm still not sure what the tapered part of the mixture seat into. It may be just a taper or restriction in the idle mixture opening and the limiting factor is the mixture scream bottoms on the threads.  Thanks again.   

Title: Re: Drilling idle mixture screw opening
Post by: blazer74 on January 17, 2016, 09:21:04 PM

Drill to want u want, the taper is on the idle screw.