Purchased a nailhead Q-jet intake off ebay that came with a carb(carb wasn't in add). Owner didn't know if this was the right carb for the intake since he had two carbs and they had been in the attic for 20+ years. He sent the carb he though went with the intake. Now that it in hands I don't think it's the correct one. I have also contacted the ebay seller about the other carb for the numbers off it. Maybe I can get lucky and get the correct carb. Would this carb be worth keeping if he would be willing to sell it as well?? Here's the numbers I see on the carb Numbers at throttle linkage 262408ma 1709 The 8 may be a B numbers in circle on rear of the carb 7032720 This is most probably a casting number. It's located on the front of the carb. I tried taking a pic but they come out blurry.
Yeah, I do believe that is the casting number you tried to take a picture of. Didn't see a place where a round metal disc would have been located. I'm with you, I don't think this is the correct carb, but I can't be positive without comparing it to mine. One of the well versed QJet guys on here should be able to sort it out though.
It's an early carb, it has the secondaries damped by the lever/piston setup. Correct throttle lever for 66-67. '66 425 carb would be 7026240...I see those numbers stamped on the side, but they're out of order! Those numbers should've been on a round tag affixed to the side. Maybe the carb was rebuilt and restamped at some point.
On the side of the carb the linkage is on appears to have remnants of where a tag used to be. It's not indented into the casting. Just looks like it was stuck to the carb with some epoxy of something. But very faint.
7026240 should be the correct number for the quadrajet for 66 Buick. Since you say you can see the 26240 portion on the driver side panel, you may have the correct carb.
Everything I see about it indicates period correct for the application. It's for sure pre-1967. Unless one is doing a perfect numbers matching restoration, I'd use a later model carburetor. For the most part, the 65-66 and some early 67's are HOPELESS for supporting big power, and can be quite troublesome in long term service. Those units are one of the reasons q-jets got a bad reputation as a performance carburetor. If you've ever heard the terms "quadrajunk or quadrabog", that's where that started. 1969 and newer units are superior in every respect. Still nothing wrong with a 65-66 Q-jet IF you get them up to par for modern fuel, and just want to drive from point A to point B and show off your ride. From what I've seen here, 100 percent of them leak at the bottom plugs, nearly that many will leak at the bypass plug installed to convert them from the plunger needle/seat set-up to the later design, and quite a few leak at the plug where they cross drilled just below and to the left of the fuel filter housing. It takes a LOT of work to get one of those up to par, and I don't think there are any choke pull-offs available for them these days.......Cliff
Thanks guys for the help. So if this is the period correct carb I'm good with that since my car is not original numbers matching. I am trying to bring it back to as close to orginal as I can. That said who here has the skills and know how to rebuild this thing and get it up to par? I may want to have it rebuilt and ready for use.
Cliff - what about a service replacement carb like I bought? How does that stack up performance wise to some of the other options out there? Not that I plan on making a street strip car but would like it to get up and run good. I think Todd is on about the same page as I am as far as what we are trying to acheive with our cars.
Depends on what you bought. Some SR carburetors were pretty much duplicates of the originals. Others will have upgrades since they were produced many years after the originals and the factory made changes to the design for the better. I'm NOT a big fan of any q-jet produced prior to 1967. The first few years have features that just didn't work well, so they were eliminated from the design in later years....Cliff
7032720 Pre 1976 7028219 DG 1938 70 - Prefix code. "70" will appear on all late '60's Rochester Carburettors. 2 - Decade produced. 2 - 1960's 3 - 1960'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
you may want to check here - that number you state is casting doesn't show up, this pub breaks things down in to individual parts numbers and exploded view diagrams for all 65-76 Rochesters http://fullsizebuickregistries.boat...s/documents/index.php?model='.$modellibrary.' 1965-76 Parts Cat Carb Dia & Parts - GM Corp - sent in by Dana Laiche
Cliff - I purchased a NOS Service Replacement Carb 7041304. I believe when I spoke to you previously you mentioned that it was a better carb than an original. I just don't believe I asked how it stacked up against some of the other QJets I could have replaced it with. Kind of a moot point now, but thought I would ask for informations sake and maybe it will help Todd or someone else in their decision. Thanks.
Here's some good reading, especially the posts by Cliff and 6Wildcat5: http://www.v8buick.com/showthread.php?269332 http://www.v8buick.com/showthread.php?212423
i cant tell u what yr it is but i can tell u its not from a buick, or a nail head engine. nail heads had the first gen 4 barrel. and the gas on any Buick, pont, olds gas line enters straight
Todd, That's the Same carb that came on my '66/425. Same numbers. We just had a discussion about these in the Thread I started, 2 '66 QJs or something like that. I got a lot of help from the people here about them. I'm boxing up One now as Someone wanted One. PONCH
I'm not sure on the 66's but the 67's gas inlet was 90 deg to the pass side I think it changed to strait on after 68 or 69
Ponch, I think I directed you towards my(this) thread as well. I really don't care for a true correct carb. But like you I have purchased another one as well. I'll decide later which one of the three carbs and or two intakes I'll use. I have both carter and rodchester setups now. Just need a rodchester breather assembly!!!
Hi Todd. I used a QJ from a '72/350, a 750, just to see how my Intake would work. Man did it Work. I only had One day to try it out. I ported out the QJ Intake on the Carb side. I have Two more like it but I'm gonna leave them alone. I painted One Red but this One Green. I had to use a 14" Air Cleaner. It Says 350 Hi Compression that I use on my Skylark Vert.I don't have my Carb Spacer cut down far enough yet. It looked kinda funny but I didn't care just then. I was in Test Mode!! PONCH
