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Topic Review (Newest First)
12-14-2007 02:36 PM
GoneNova/406 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.
12-14-2007 10:16 AM
impalaman63 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
12-14-2007 09:30 AM
poncho62 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.
12-14-2007 09:05 AM
impalaman63 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
12-14-2007 08:53 AM
poncho62 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.
12-14-2007 08:31 AM
impalaman63 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?
12-13-2007 08:04 PM
hardhatz What would be a better choice the 1965 quadrajet intake?

You could also get an aluminum stocker from an 80s 305 Q-jet Camaro for almost nothing. The carb & air cleaner from the same car would work well.
12-13-2007 11:39 AM
impalaman63 poncho62
Nice car. Have you ever been to the Back to The 50's in MN one of the BEST car shows around , 11,000 plus cars each year. Next years show June 20,21,22 2008 Check out the web site at http://www.msra.com/
12-13-2007 11:07 AM
poncho62 I would go with the edelbrock....if nothing more than, you can bolt either a spreadbore (Quadrajet) or squarebore (Holley, Carter, Edelbrock) to it........

The Quadrajet that you are looking for is a pre 75 (I think)....the serial # will start with 70...not 170.......The sreial # is stamped up the side of the back barrels on the drivers side of the carb.

Love the car BTW...I have a 62 Canadian Pontiac which is very similar.
12-13-2007 11:04 AM
baddbob
Quote:
Originally Posted by impalaman63
Would a 450 CFM Spreadbore Economaster Carb be a good choice?

These are really good carbs for a mild street smallblock, it'll work excellent on that 283. I don't think Holley has made them for quite awhile but it was very common to find them under hoods in this area years ago. Usually ebay has a good selection.
12-13-2007 10:39 AM
impalaman63 What would be a better choice the 1965 quadrajet ntake
or the 2101 edelbrock performer
Also what year quadrajet carb should I get . Going on a stock 283 dual exhaust
12-13-2007 08:19 AM
poncho62 65 I believe.............That one in the picture is a later one....maybe 68-74, judging by the lack of oil fill hole and spring choke setup. It would work on your 283, but you would have to get valve covers with an oil fill access.
12-13-2007 07:57 AM
impalaman63 What was the 1st year of the Quadrajet intake manifold?
What would be the best year Quadrajet Carb to buy for a 283 ?
12-12-2007 08:18 PM
hardhatz Q-Jet
They even put them on 2.8 Mercedes-Benzes in the 70s, and they were not overcarburated.
12-12-2007 01:13 PM
barnym17 My personal opinion is that the q-jet will better for mileage and performance.
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