quadrajet ?

[slamdpup]

is there a quad website? or can someone on here tell me what year quad i have..and what numbers would you need to identify it...thanks

[Buckle]

Originally Posted by slamdpup

is there a quad website? or can someone on here tell me what year quad i have..and what numbers would you need to identify it...thanks

Slamdpup,

The OEM numbers are stamped vertically on the driver's side of the carb, near the throttle linkage. There are some quadrajet i.d. sites on the web that I remember seeing, do a google search for quadrajet id or something.

Post your numbers and I'll decode it for you.

Buckle

[FatFndr]

Try this website - http://www.recarbco.com/technical/rochester/qjet.html

This is part of the information you will find:

The Rochester Quadra-Jet was a very popular carburetor on many GM vehicles from the mid 60s to the late 80s. The first was in 1965, on large Chevy V8s. By 68, the Q-jet was GM's main 4 barrel carb. The OEM numbers are located on the driver's side of the carb, near the throttle linkage. The numbers run vertically.

The Q-jet oem numbers go like this:
70YYEDT or 170YYEDT

70: Rochester carbs started with either 70 (before 1976) or 170 (after 1976).

YY: The year code. The years are a little convoluted, but probably the easiest part to remember.
1965
25
1966
26 (or 36 on A.I.R. engines)
1967
27 (or 37 on A.I.R. engines)
1968
28 (or 38 on A.I.R. engines)
1969
29 (or 39 on A.I.R. engines)
1970
40
1971
41
1972
42
1973
43
1974
44
1975
45
1976
56 (the year they started the 170 prefix)
1977
57
1978
58
1979
59
1980
80
1981
81
1982
82
1983
83
1984
84
1985
85
1986
86
1987
87
1988
88
The code for 1965 would be either 25 or 35, 66 would be 26 or 36, 67 would be either 27 or 37, etc. 1970 is 40, 72 is 42, 75 is 45. You get the idea. The 80s are easier because they're usually straightforward. 81 is 1981, 84 is 1984.

E: The emissions code. 2 is for 49-state emissions, 5 is for California & high altitude.

D: Division. 0, 1 and 2 are Chevy, 3 is Cadillac, 4 is Buick, 5 is Oldsmobile, 6 and 7 are Pontiac. Rochester doesn't always follow this rule.

T: Transmission. Even numbers are automatic trans, odd numbers are manual trans. Rochester also doesn't always follow this rule.

This guide is just that: a guide. It is not set in stone, because it is a documented fact that Rochester didn't follow these rules 100%. It is for Quadra-jet carburetors only. Rochester also had different numbering systems for their other carbs besides the Quadra-jet. Our thousands of pages of information on this comes straight from Rochester.

Keep in mind that just because the OEM numbers between two carbs may be different, it doesn't mean they are different carbs. It's very possible to have two carbs, their date is 2 years apart, one is for Buick and one is for Chevy Truck, and one is for automatic, the other for stick, and the carbs are identical in every single way, even down to the jets and metering rods. It's much more common than you might think. Also, many people think they have to have a carburetor with a certain exact OEM number. This can sometimes be very very hard. Most people don't have to have this, they really only need a carburetor that crosses over the same and is identical. You realistically only need an exact OEM number if you are restoring a car back to original condition to enter into a car show.

[Enginetuner]

Wow!!, Great information, thanks

[slamdpup]

Originally Posted by Buckle

Slamdpup,

The OEM numbers are stamped vertically on the driver's side of the carb, near the throttle linkage. There are some quadrajet i.d. sites on the web that I remember seeing, do a google search for quadrajet id or something.

Post your numbers and I'll decode it for you.

Buckle

heres the numbers thats on my carb..
17081226
0670 DDS...
i looked on the site thats posted but didnt see my carb

[FatFndr]

Carb #170 81 2 2 6 - I'm guessing here but it may be that the 170 designates that it was built after 1976, the 81 indicates it was built in 1981, the 2 says that it is 49 state emmisson tested, the next 2 says it's a Chevy but the next number (6) says Pontiac.....maybe it was used by both manufacturers, you need to dig a little further.....try Google or another search engine on the internet........good luck

[RadioFlyer]

I work it out to be a 1981 model year, 49 state, chevy carb (90degree fuel inlet). Produced on the 67th day of 1980.

Do not swap early primary metering rods with late models (70xxxx carbs vs the 170xxxx carbs) the rods are a different length. Secondary rods all interchange.

Alex.

[slamdpup]

hey guys im not really motor wise..i had this quad rebuilt ..i installed it on the car today got it all hooked up linkage ,choke,gas line...and now it want crank..the guy that rebuilt it said he adjusted it to factory specs..but i it the key and it want crank..its getting gas ,quirts a good stream..but want crank...is it possible toadjust this carb without the having the car running when being adjusted?..its a 1968 327 motor with the 1981 quadrajet ..i have him put a brand new elcetric choke on it..and its getting power ..i checked..its geting gas ..i checked...could it be adjusted wrong and fludding itself out or not getting enough gas?...it just turns over and over..not even a almost start up..it doesnt have a flat head screw for the air and gas mixture so i have to get a D head screw driver to play with it..but also i pulled some of the plugs to see if they were wet and no they wasnt wet at all

[39 lives]

No doubt, FatFndr, good info to know. Thanks.

[slamdpup]

Originally Posted by slamdpup

hey guys im not really motor wise..i had this quad rebuilt ..i installed it on the car today got it all hooked up linkage ,choke,gas line...and now it want crank..the guy that rebuilt it said he adjusted it to factory specs..but i it the key and it want crank..its getting gas ,quirts a good stream..but want crank...is it possible toadjust this carb without the having the car running when being adjusted?..its a 1968 327 motor with the 1981 quadrajet ..i have him put a brand new elcetric choke on it..and its getting power ..i checked..its geting gas ..i checked...could it be adjusted wrong and fludding itself out or not getting enough gas?...it just turns over and over..not even a almost start up..it doesnt have a flat head screw for the air and gas mixture so i have to get a D head screw driver to play with it..but also i pulled some of the plugs to see if they were wet and no they wasnt wet at all

i wasnt getting fire...i had the elcetric choke wired to the tach sid eof the distributor ..and for some reason it was cutting the power from the ignition side of the distributor..can anyone tell me why that happened...with the choke wire unpluged the ignition side was hot but when the choke was pluged in the ignition side wasnt hot but the tach side was hot when the ignition was on ..then unplug the choke from the tach side the ignition side was hot agian....anyway its cured..wired it to the ignition switch...

[saltracer219]

Originally Posted by slamdpup

i wasnt getting fire...i had the elcetric choke wired to the tach sid eof the distributor ..and for some reason it was cutting the power from the ignition side of the distributor..can anyone tell me why that happened...with the choke wire unpluged the ignition side was hot but when the choke was pluged in the ignition side wasnt hot but the tach side was hot when the ignition was on ..then unplug the choke from the tach side the ignition side was hot agian....anyway its cured..wired it to the ignition switch...

The Q-jet you have is A MODEL M4ME it is off of an 81 Chev P.U. with a 305 v8. Not really the best choice for your early motor since it is an emissions carb but a good carb guy could make it work ok for you.