Metering Rod and Jet Combos

[Ethan1]

 Hey Guys,

 I know a lot of people have asked what my secret is, well here it is.

 Look up the part number for the jet (jets are always decoded using the last two digits of the part number), metering rods and metering holder (which is always 7034512 "K") and decode them using these pages:

 http://www.oldengine.org/unfaq/leadfoot/qrodpri.htm for Primary Metering Rods
 
 http://www.hioutput.com/tech/qjetrod.html for Secondary Metering Rods

 Let me know if you need any help!

 FWIW, this only works from 1967-1980.

 Ethan
 

[Ethan1]

 Part numbers can be found in the big AC Delco books or at:

 http://newagemetal.com/

[Ethan1]

 Adding a website with part numbers for the earlier primary metering rods as well:

 http://www.gmcmi.com/wp-content/uploads/2014/05/Quadrajet-Carb-Primary-Metering-Rods.pdf

 

[Ethan1]

Part number 17111346 was used on several of the mid-80's Q-Jets.

Here is the items in that kit:

.075" Primary Jets
61S Primary Metering Rods
EF Secondary Metering Rods

HTH, Ethan!

[Ethan1]

 Here is another kit 17067147:

 .072" Primary Jets
 51M Primary Metering Rods
 DR Secondary Metering Rods
 33797 Secondary Hanger

[Ethan1]

 http://www.gmpartswiki.com is a great website for the '81-Up Qjets.

[Ethan1]

 PLEASE READ: 1981-UP Quadrajets used a part number called a metering rod and jet kit part number. They DID NOT put specs of a Quadrajet carb number (81-UP) in the manual. Just one simple kit part number. In that kit, it contained the primary metering jets, primary metering rods, secondary metering rods and secondary hanger. If you by chance run by an AC Delco metering rod and jet kit, please let me know, so I can jot down the info on here.

[unruhjonny]

interesting.
Thanks for sharing this Ethan!
I have a couple older MPC's, but decoding the secondary metering rods, and hangars has always been a mystery to me...

[Ethan1]

interesting.
Thanks for sharing this Ethan!
I have a couple older MPC's, but decoding the secondary metering rods, and hangars has always been a mystery to me...

 Cliff also lists the secondary metering rods part #'s in the back of his book, too. FWIW

[Ethan1]

Here are some part numbers for youz power piston springs:

3Hg spring 7029922
3Hg spring 7037851
4-8HG 7036019
6Hg spring 7037305

[sep455]

I'm a little confused, if I want to re-jet my carb richer, and go from a 68 jet to a 70 jet, then how do I choose the correct corresponding primary rod?

[Ethan1]

I'm a little confused, if I want to re-jet my carb richer, and go from a 68 jet to a 70 jet, then how do I choose the correct corresponding primary rod?

Do you have Cliff's book? You basically want to go with
a size smaller metering rod then. If you were leaning, then a size bigger. It's all about the size of the jet and how much that metering rod fills up the hole, that determines if you're leaning or richening it. Get Cliffs book and look at the metering rods and there corresponding sizes.

[7228Sedan]

In case anyone is interested:

Delco metering kit 17078767:

70 jets
42 primary rods
CL secondary rods
K hanger

Also packaged as Mercruiser  Quicksilver part 1397-8583

Application 454 inboard standard output 340HP

[Jamesediny]

I believe that you need to write more on this subject matter, it might not be a taboo subject but generally people don't speak about these topics. To the next! Cheers!!

[monty]

I could use some advice/help/suggestions here. I grew up in the 70s with carburated cars although I never really got deep into the rebuilding of them. I have two Quadrajets which I have rebuilt recently and tore back apart more than once because I cannot get my 78 chevy pickup to idle very well. I Just finished a forth install today and got it running. After it warmed up it stumbled some for a bit then it settled down.I set both air screws at 2 turns initially and after warmed up and choke opened I reset them. I turned the driver side jet all the way in and the engine remained running at the same speed with no real change in idle. There is a slight miss noticeable while idling. It Seems to accelerate fine and sounds good with no missing. Thank You for any suggestions   Monty