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  #16 (permalink)  
Old 12-14-2007, 08:31 AM
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Just bought this intake off ebay. 1968 Q-jet #3919803 for $20.00

I will be looking for a Economaster carb with 450 cfm

or a Q-jet from a 1966 Chev.# 7026202 Can you put a electric choke on this Q-jet carb?
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Old 12-14-2007, 08:53 AM
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That intake should work for you.......

That carb is designed for the spring choke .........the spring goes in that pocket in the manifold. The electric choke carbs will bolt to your manifold with the proper gasket.
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Old 12-14-2007, 09:05 AM
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This type of choke ?
Also how do you find out what cfm's a Q-jet has? There are so many to chose from or what is the cfm's on the primaries and the total on secondaries i
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Old 12-14-2007, 09:30 AM
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Yeah that's the one.............

I am no expert on Quads.......I think there are just 2 cfm ratings...725 and 800 on some big blocks....but don't let that get you down. Quads are a different type of carb......on a small engine, they will only flow what is needed.....If it needs 500 cfm, thats what you get. Maybe someone else on here can explain how they work better. When it comes to mileage, they are pretty hard to beat.
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  #20 (permalink)  
Old 12-14-2007, 10:16 AM
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Found some info on Q-Jets they came in 486 cfm, 553 cfm, 600 cfm ,692 cfm,700 cfm, 750 cfm and 800 cfm. The primaries are rated at 160-225 cfm . I still need to find out how to tell what cfm's are on a Q-jet carb .

Decode your Q-jet

Produced 1976 or later
17080243
2629 CNO
170 - Prefix Code
8 - Decade Produced
5 - 1976-1979 (1705)
8 - 1980's (1708)
0 - Year Produced
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
6 - VariJet (2 bbl) Fed
4 - Division.
0, 1, and 2 all indicate Chevrolet.
4 - Buick
5 - Olds
6,7 - Pontiac
3 - Transmission
Even numbers - Automatic Transmission
Odd numbers - Manual Transmission
CNO - Customer Code
2629 - Date Code
262 - 262nd day of the year
9 - Year

Pre-76
7028219
DG 1938
70 - Prefix code. "70" will appear on all late '60's Rochester Carburetors.
2 - Decade produced.
2 - 1960's
3 - 1060's with A.I.R.
4 - 1970-1975
8 - Year produced. 8 = 1968
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
6 - VariJet (2 bbl) Fed
1 - Division.
0, 1, and 2 all indicate Chevrolet.
4 - Buick
5 - Olds
6,7 - Pontiac
9 - Transmission
Even numbers - Automatic Transmission
Odd numbers - Manual Transmission
DG - Customer code.
1938 - Date Code
193 - 193 rd Day of the year
8 - Year
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  #21 (permalink)  
Old 12-14-2007, 02:36 PM
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have you tried tuning your q-jet?i don't see why it wouldn't work as well as anything.perf.wise too.if i were going to buy something though i think i would go with a 600 holley.also i have a chevy #'s book that says the q-jet manifold first appeared on 67'chevy's.

Last edited by GoneNova/406; 12-14-2007 at 02:58 PM.
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