Q-Jet ID please.

[Greg L.]

Could some of you Quadrajet experts help me figure out what this is for. I don't think the base plate is original but other than that I really have no idea what it could be for.



There is a number "355" stamped in the aft, L/H corner of the base plate that might be a date code but that is it for stamped numbers. I'm guessing that it's 65-66 vintage but I'm no expert.

Thanks.

Greg Linton

[Lyndon S.]

Re: Q-Jet ID please.

It looks like a late 60s carter built Q-jet.

[Greg L.]

Re: Q-Jet ID please.

That's what I thought on first glance but then I see noticed it used to have the part number stamped onto that disk(which is missing) so that led me to think that it was earlier.

It also has a vacuum port above and to the right of the fuel inlet as well as some "funny" linkage where the choke rod comes up through the air horn...

[Clem Z.]

Re: Q-Jet ID please.

what type of needle seat assy does it have as the very early ones has a special one. it is not like any type you have seen in any other carb.

[Greg L.]

Re: Q-Jet ID please.

Ya you are right about that Clem. The only ones I have ever seen screw in but this one is held in place by a tab with two tiny screws. The primary rods piston is also held in place with a little clip. Others that I have seen just push down into the piston bore and are held in place with a plastic bushing.

[Clem Z.]

Re: Q-Jet ID please.

the change happened in 67. old style carbs,7027200-201,7037200-201,7027202-203,7037202-203. new style carbs 7027210-211,7037210-211,7027212-213,7037212-213

[Greg L.]

Re: Q-Jet ID please.

Thanks Clem, so basically this is a 7027200-201,7037200-201,7027202-203 or 7037202-203..correct? Could it possibly be older than 67 or is there something that you see that points to the numbers you referenced?

[Clem Z.]

Re: Q-Jet ID please.

it could be older because the Qjet started on 396 chevys in 1965. during the 67 model year is when the needle/seat changed to the conventional type

[Greg L.]

Re: Q-Jet ID please.

Okay then..so it's before the change-over date in 67. Thanks a lot, that sure helps to narrow it down.

Do you know where I could find some more info on it to try and narrow it down even further. Did any 65-67 Corvettes use the Q-Jet? If not then it's obviously not even for a Corvette...

What do you think of the throttle plate....does it look correct for that carb? I thought that the threaded vacuum connection in the rear was a 70s thing but maybe not.

[Clem Z.]

Re: Q-Jet ID please.

1966 chevy Q jet part # 7026202-210-203. check these # to see if they were used on a corvette. buick started using Q jets in 1966,caddy 1967,olds 1966 and pont 1966

[Joe L.]

Re: Q-Jet ID please.

Greg------

Although used on various Chevrolet models since 1965, the Q-Jet was not used on ANY Corvette until the 1968 model year. So, this carburetor was never originally used on a Corvette. However, it is generally similar in external configuration to those Q-Jets used on 68-72 Corvettes.

[Greg L.]

Re: Q-Jet ID please.

So since there is no part number stamped on this carb do you guys think it would be possible to narrow down the application a little closer based on it's physical features?

Clem was very helpfull in determining that it is before the needle/seat change over in 67 and I don't think any other divisions used the 90 degree fuel inlet besides chevrolet so that puts it at a 65-mid 67 chev application or over the counter replacement.

Is there any other features that could be used to help narrow it down...maybe jet or rod sizes? Since this isn't a Corvette carb is there another site that you guys might know of that I could try for this info?

[Clem Z.]

Re: Q-Jet ID please.

all the carbs use #71 jets. the 396/427 used #44 and #41 rods. the 327 used #45 and #43 rods

[Greg L.]

Re: Q-Jet ID please.

How do you tell what size the rods are? If I remember right, other rods I have looked at have the size stamped on them but these have nothing on either one. The secondary rods hangar has a "K" stamped on it but that's it...

[Clem Z.]

Re: Q-Jet ID please.

mic the diameters as the #s are in thousands of a inch. # 45 should mic .045