Cliff's Quadrajet Parts and Rebuild Kits

Quadrajet Problem Solving => Diagnose a Quadrajet carburetor problem => Topic started by: 65malibu on March 28, 2025, 07:29:20 AM

Title: Primary rod depth in jet
Post by: 65malibu on March 28, 2025, 07:29:20 AM

Is there a preferred depth to use as a starting point when setting primary needle height? I'm reassembling my #17084226 with 50M needles and #74 jets and was wondering where would be a good bench setting.  Where should the step be located inside the jet when the needle is at its lowest point?

Title: Re: Primary rod depth in jet
Post by: Kenth on March 28, 2025, 10:07:52 AM

I have found that the APT is set between 3.5 to 4.5 on various units.
4.0 would be a good starting point before the "tip-in" test at 2200 rpm.
Note: the piston starts rising at 2 turns from seated.

HTH