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Primary Rods

There are two varients of primary metering rods for the Q-jet. Rods used with 70xxxxx carbs are longer than rods used with 170xxxxx carbs, hence, they are not interchangeable. Replacement rod part numbers correspond with carb numbers, rods whose part numbers start with 7 fit 70xxxxx carbs. Rods with part numbers starting with 17 fit 170xxxxx carbs. If your starting with a randomn assortment of rods, the longer rods fit 70xxxxx carbs.
The last two digits of any rods part number corresponds to the diameter of the rod at its "leanest" point. Each rod is stamped with these same two digits.
Following the rod diameter stamping is a letter denoting single or double taper, and the tip diameter at its richest point.
"A" Rods are single taper, "B" (and all others) are double taper.
All rods, except those noted below, have a .026" diameter tip.
"M" =.032" diameter tip
"50D" has a .036" diameter tip

Q-Jet /DualJet Primary Metering Rods
Part NumberRod StampingPart NumberRod StampingPart NumberRod StampingPart NumberRod Stamping
703483232B704353030J1705134040K1705694848M
703483333B704353636J1705134141K1705694949M
703483434B704353838J1705134242K1705695050M
703483636B704354040J1705134343K1705695151M
703483737B704354141J1705134444K1705695252M
703483838B704354242J1705134545K1705695353M
703483939B704354343J1705134646K1705695555M
703484040B704354444J1705134747K1705774242P
703484141B704354545J1705134848K1705774451M
703484242B704354646J1705134949K1705774545P
703484343B704354949J1705135050K1705774646P
703484444B704633850D1705135151K1705774747P
703484545B704790549C1705135252K1705774848P
703484646B704790651C1705135353K1705774949P
703484747B704790753C1705223049E1705775050P
703484848B704874244C1705333434L1705775151P
703484949B704874345C1705333838L1705775252P
703485050B704874547C1705334242L1705775353P
703485151B704994242C1705334343L1705775454P
704070050C1705009953E1705334545L1705775555P
704070152C1705133838K1705334646L1705775757P
1705133939K1705635858P
1705636363P

Information Taken from AC Delco catalog 9A-100, "New Carburetors, Carb Kit and Parts". Verify any information. Transcription errors may exist.
AFAIK, the above rods are still available at your AC Delco parts counter.

-If you are looking to build a Q-jet to exact stock specs for your vehicle, the AC Delco dealer has the ability to look up exact applications and provide stock configuration information. (Primary rods, jets, secondary rods, hanger, etc.)
-If your vehicle is close to stock, 99% of the time the primary side of the Q-jet can be left alone to retain decent light throttle characteristics.


This information is only intended as an overview and may not include all the necessary information, data, or facts.
Every vehicle is unique, and research for your particular vehicle is recomended.


Page originators site

This Page Created By Alexander M. Bilan (lead.foot@usa.net)
June 12, 1997
Revision 1.0 June 12,1997