General Category > Quadrajet Carb Talk and Tips

does anyone manually check primary rods?

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unruhjonny:
Does anyone manually check primary rod sizes?

or maybe more accurately I should ask:
Has anyone measured rods, to confirm sizing, and/or noticed that the stamped sizing was wrong?

I ask, because I stumbled on what I believe to be a mis-stamped rod size.

*disclaimer*

About twenty-or-so years ago, I would regularly pop open early "70" quadrajets, to harvest the "guts"... yup, that was me.
In my defense, locally these carbs were never bought - they would sit, and get crushed with the rest of the car when time came... at least at the yard I went to.
And in all my years of parts scrounging at this yard, I only came across two pre-1973 Pontiac Quadrajets (even 1973-1974 Pontiac Quadrajets were rare); a 7029268 and a 7042264...

Ok, back to the nature of my question;
This past year I grabbed while at hte Portland swap meet two "core" 1973 Pontiac carbs, one was an in-house Carter manufactured unit;
This carb had jets and neeldes with not identifiers;
Two nights ago, I went into my small stash of parts, and decided to pop open a container which had two sets of "47" rods, to measure and compare against the un-numbered rods from the Carter Quadrajet.

Long story short, the "47" rods I grabbed actually measured more around 42 - and upon closer inspection were visually thinnner than the other set of 47's;
I then proceeded to measure several other sets of rods to ensure I was measuring at the right spot, and it appeared as though I was correct - all the other sets I measured aligned with the stamped sizing EXCEPT for this one set of "47" rods...

BTW, the un-numberd pair appeared to be 43...

Macadoo:
I recently had the same issue.  The carb was an eBay rebuild special (and boy was it special) so I have no clue how used the rods were.  They were stamped 54 but measured 48.  With reading glasses and a magnifying glass I they looked perfectly round to me and considering how a rod sits inside a jet, I wouldn't expect this from a worn rod.  It's a mystery.

unruhjonny:
I don't think I've ever come across a "54" rod;
the ones I have seen range from 32(B) through to 53(C)

Frank400:
I check all the ones I put in builds and never came across this "problem" but I'm not that surprised.  I measure everything twice, regardless of what's written on it.  That way, when you encounter a problem while tuning, you can pinpoint it more easily.

   Most of the times, I use new stuff because old jets are sometimes egg shaped.

Macadoo:

--- Quote from: unruhjonny on September 14, 2018, 10:58:01 AM ---I don't think I've ever come across a "54" rod;
the ones I have seen range from 32(B) through to 53(C)

--- End quote ---

I'd have to dig them out but I'm pretty sure they were 54.  "M" series maybe.

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