1973 Chevy C/20 Quadrajet part # ?

[RPOZ11]

1973 Chevy C/20 Quadrajet part # ?

I am having to go and rebuild my motor.

I realize that the carb on my motor isn't the original one.

I am trying to determine which correct Quadrajet part # I need to make it correct again.

My C/20 is a factory 454 truck.

I have narrowed down the # to fall into this group:

7043200 - 7043212

I found one as : 7043207 as used on all transmissions with a 454 that year.

I THOUGHT that all ending in an ODD # was for a Manual Transmission.

Does anyone here have a true listing for the correct used Quadrajet Carbueretors for the 1973 year application???

Help

[Walts_restoration]

my dads truck is a 73 350 with a 4 speed all original untouched, auto trans did differ from manual, and i believe the 454 would have a bigger carb than the 350 and different part number. I do know, almost 99%, that 73 carbs are all by themselves, then 74 (we have a few trucks, 2 73s and like 3 74s, all 350s) , and then 75-79ish (at least on the heavier half tons and up, non emissions)

[jd74c-10]

73 454 c-10/c-20 auto, 7043200, 73 454 c-10/c-20 manual, 7043201, 73 454c-20/c-30 any trans, 7043207, 73 454 c-20,c-30 calif. any trans. 7043507 hope that helps

[RPOZ11]

Originally Posted by jd74c-10

73 454 c-10/c-20 auto, 7043200, 73 454 c-10/c-20 manual, 7043201, 73 454c-20/c-30 any trans, 7043207, 73 454 c-20,c-30 calif. any trans. 7043507 hope that helps

OK, I am working with all of this!!!

I was reading, only a suggestion, that the 7043207 was a 650-750 CFM.

The 7043200 was listed as an 850 CFM.

This gets me tangled.

How do we actually determine how a Quadrajet is in actual CFM?

There must be a process to determine CFM for each Quadrajet.


Just to clarify, my desire here is to get the correct CFM and the correct part numbered carbueretor for my truck.

[RPOZ11]

I located a 7043208 , seeings I dont see to much about this part number.... so I bought it.

I still am seeing these 7043200 units around alot.

Anyone who can add to this???

[jd74c-10]

the 7043208 came on the 1973 350 in the c-20/c-30/k-20/and k-30 according to my books. i have been thinking about your question about cfm of these carbs. i can't find any way to find a listing of cfm on q-jet's there used to be a place in phoenix called C.W.CARTER that had all carb parts and info but i don't know if they are still there. i don't know if this will make any sense,but here goes, if a carb is on a heavyduty truck that is built for lowend torque then it would not need a high cfm carb. but a light duty truck that is built more for higher speed and rpm the factory would use a higher cfm carb. so if that make any sense then the carb # 7043200 auto. trans & 7043201 manual trans. which came stock on 73 c-10/c-20 would be a higher cfm than # 7043207 which came stock on 73 c-20/c-30 trucks, plus the # 7043507 which came on all calif c-20/c-30 trucks would be total junk because of cali. smog rules . i don't know if this make's sense or if the heat has gotten to me. it is probaly the heat. see if you can find c.w,carter. Jim i just found the number to cw carter 602-258-3929 call them they should be able to answer you question's

[jd74c-10]

1973 454 c-10/c-20 auto 7043200 ,73 c-10/c-20 454 manual 7043201, 73 c-20/c-30 454 any trans 7043207,thats what my book shows, hope it helps, jim

[RPOZ11]

It's a start Thanx!!!

As I recall, up to about 73/75....

All those that ended with the 200, ie: 7043200, I think, were warranty or replacement versions.

I could be wrong...

[RPOZ11]

I just found this listing:

1973 Rochester Quadrajet 4MV Carburetors

7043200
7043201
7043202
7043203
7043207
7043208
7043210
7043211
7043212
7043213
7043215
7043216

How to ID / Read The Part Numbers:

Example: #70 4 3 2 0 0 EH 0742

70 - Prefix code. "70" will appear on all late '60's Rochester Carburetors.

4 - Decade produced.
***2 - 1960's
***3 - 1060's with A.I.R.
***4 - 1970-1975
***5 - 1976-1979
***8 - 1980's

3 - Year produced. 3=1973

2 - Model

0 - Monojet (1 bbl) Federal standards
***1 - Two jet (2 bbl) Federal standards
***2 - Quadrajet (4 bbl) Federal standards
***3 - Monojet (1 bbl) California standards
***4 - Two jet (2 bbl) California standards
***5 - Quadrajet (4 bbl) California standards

0 - Division. 0, 1, and 2 all indicate Chevrolet.

0 - Transmission
***Even numbers - Automatic Transmission
***Odd numbers - Manual Transmission

EH - Customer code.

0742 - Date Code



Now, which one is correct for my truck