Air_Adam

Hey guys, I need some help. I have this Qjet I took off an old '75 Eldorado 500ci (supposedly the big 800/850cfm unit?) and I just checked out the numbers on the side, and they don't really make any sense with any of the Qjet ID decoding websites I've found. The carb number is:

7045193

If I understood correctly, the 7045 says its for the '75 model year, which is right, but the '1' says its a 2bbl, I can't find any info on the '9', and the '3' says its for a manual trans car, which the Eldorado was not.

Whats up with these numbers?

I also have a set of 'AR' and 'HG' secndary metering rods, and 'I' and 'H' hangers. I can't find any info on these parts either, does anyone know anything about these as well?

Also, is there any way to find out if its the 750cfm carb, or the 800/850 unit? Aside from some cleaning and a carb kit, the carb is in pretty nice shape.. everything moves smoothly, the throttle shafts are still nice and tight (no need for bushings, etc)

Any help appreciated!
Thanks!

Sonix

iTrader: (1)

This is just a note-to-self so I remember to reply to this thread later tonight at home, when I have all my links, and books by me.

Measure the primary throttle bores, if you have a known 750cfm unit, it'll be smaller. I don't have the #'s offhand now, I can get them at home. The bigger one is 800cfm.

Damon posted a chart on TGO here with the rod sizes, is AR or HG not on it? 1975 is right after the transition from the funky primary rods to the post 1974 size. Not sure if 1975 was a transition year, so i'd try to measure up the primary rods in it, and make sure they're the same height as your others, just to be sure. You can always lay your new secondary rods next to other rods, to eyeball sizes. DD rods are so obviously fat that they're a dead giveway compared to DR rods - as being inferior for performance.

I never really pay much attention to the casting # on the carb, I mean, what will the #'s actually give you, by the end of the day? i'd measure the air bleeds and open up the mixture screw adjustment holes, then try tuning it on the car. (Do you really need an 800cfm q-jet on your 350?)

327_TPI_77_Maro

iTrader: (8)

That number will not decode the same as the later 170.... etc numbers. However it has a normal format and number of digits. Hopefully Sonix can help you out.

Also, not all later than 75 carbs have the longer M and K rods. Heavy duty trucks as late as 78 (17085213 is a # that I recall) use the early style shorter rods in a non APT, non feedback carb (it has the exact same housing as a late 60s 327 Qjet I had). I see them on vans all the time. Only the APT Qjets 75+ used the M and K rods.

five7kid

iTrader: (14)

Google results:
http://www.carburetor.ca/carbs/catal...lac/index.html
http://www.carburetor.ca/carbs/tech/...jet-index.html
http://88.191.12.109/forum/index.php?showtopic=1816

Randy82WS7

look donw the primary bores at the ring in there and see if its small or large

large= the smaller CFM

small= the larger CFM

i thought it was 750 and 800

but it could be 800 and 850

i forget...

alot of the oldsmobile and caddy ones and many of the GM BB ones were the larger CFM

theresa billion pagesand sites on the net with hanger and rod and jet codes and other good info on these carbs

research google

good luck