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Quadrajet Carb Talk and Tips / Re: NEW QUADRAJETS
« Last post by qjetsrule on December 05, 2021, 08:05:32 PM »
Also available for Pontiacs
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Quadrajet Carb Talk and Tips / Re: Remanufactured Carburetors
« Last post by Brian B. on December 05, 2021, 08:50:22 AM »
X 2 regarding the cavalcade of performance parts from the late 70s and 80s.  I didn't race back then but my pocketbook kept me from getting impacted too much.
 I did however spend money on an aluminum intake that didn't seem to contribute much which I tossed.
Best thing I did do was keep my Quadrajet and install some good tri-y headers from H-O Racing.
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Lobby / Re: Base plate APT screw removal success!
« Last post by Cliff Ruggles on December 05, 2021, 02:56:13 AM »
Good news that you were able to get it out and replaced.  I'm pretty good at it since I get a LOT of practice.  It's never a 100 percent success rate but IF you follow the steps mentioned in your post you'll get most of them without issue.  The "key" to success is to make a good fitting flat blade screwdriver and don't try to force it until it's ready to come out.........
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Quadrajet Carb Talk and Tips / Re: Remanufactured Carburetors
« Last post by Cliff Ruggles on December 05, 2021, 02:53:25 AM »
Lars obtained one and dissected it.  Considering the time spent and what was needed to get it working OK one could start with a clean virgin core and build two or three of them with the same effort.

I'd note here that there are PLENTY of 1972-1978 Chevy divorced choke Q-jets still readily available and many have never even been apart.  It was very common in that period to yank them off of engines before they reached their first birthday and install an aftermarket aluminum intake and shiny new carburetor.  The factory was hit HARD with tightening emission standards and those carburetors were super lean and difficult to make work correctly, not to mention the engine they were sitting on had LOW compression, tiny retarded event camshafts in them, and other emission control devices to choke those engines down pretty hard.

Edelbrock in particular targeted that market pretty hard and sold millions of carbs/intakes.  The advertising was so good that folks jumped all over that deal with just about every 350 SBC engine that left Detroit in that period.  With all the promises of improved performance, fuel economy, etc, etc, they talked a LOT of folks into going that direction.

Lucky for me I grew up a dirt poor farm boy and couldn't afford any of it, so I spend my time working with the factory parts instead.  When I did dabble with aftermarket carbs and intakes I was ALWAYS very disappointed in the end results.  About all I saw was INCREASED fuel consumption for "normal" driving, worse ET and MPH at the track, and some "cobbling" involved with making those parts fit.  Talking about it decades later I can say for sure the ONLY statement they made to get folks to buy those parts was that it took some weight off the front of the vehicle.

Back then virtually NO ONE tested anything, they just removed factory carbs, intakes and distributors, bolted on aftermarket stuff, put the stickers in their windows, jacked their cars WAY up in the rear, installed loud as hell glass packs and cruised the streets at night.  If they could do a decent burnout leaving the High School parking lot after a ball game the parts made the grade.

I was already drag racing my car and had it well dialed in.  Every single time without exception I removed a very well dialed in factory part with something from Edelbrock, Holley, Mallory, Crane, etc my car slowed down at the track.  The funny part was that many of those parts I installed "felt" stronger on the street, especially the big intake manifolds and larger camshafts.  I lost count of how many times I'd install a part and street test it leaving a BIG grin on my face and fully expecting to run a full second quicker at the track the next outing, then get my time slip after the first run with the new part and NEVER went quicker.

What I was experiencing with many of these parts was a "shift" in power, not making more of it.  Big intakes and camshafts shift power to the upper mid-range and top end often killing off low end and average power.  Without other changes like gearing and looser converters the vehicle will run worse more times than not.

Anyhow, back on track and I'll say here that unless one of those Chinesium pieces of bovine excrement fall in my lap it's unlikely I'll ever see the inside of one or waste my time messing with them for pretty much the same reason I avoid anything commercially "remanufactured" like the plague......FWIW.......Cliff
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Quadrajet Carb Talk and Tips / Re: Main Well Bleed Tube Depth
« Last post by Cliff Ruggles on December 05, 2021, 02:33:29 AM »
From the factory they are driven in until the ends just barely stick above the material in the airhorn that holds them in place.  It's really not a big deal and they will work fine if you drive them in a little further.  It's one of the parts of the carburetor where exact precision really isn't required, at least from the testing I've done in that area.  I'd also note here that the Ford 429 Cobra Jet carbs didn't use them at all.

Prior to writing my book I did extensive track and dyno testing and part of it included bleed tubes.  I found that using a .036" bleed tube was a very good place to be with long tip secondary rods in the .040-.052" range.  In really hot/humid weather at my altitude (about 1200' above sea level) I could got a tad leaner but started to experience some "surging" past .060" but no detonation or other negative symptoms.

Others may get completely different results.  This often happens when you aren't using custom machined secondary rods all cut from the same cores with the same tip length, upper section size/taper and same included angle leading to the tips....FWIW........Cliff
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Quadrajet Carb Talk and Tips / Re: Main Well Bleed Tube Depth
« Last post by Brian B. on December 04, 2021, 12:08:30 PM »
FWIW.....I set mine at one inch today and car performed fine.
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Quadrajet Carb Talk and Tips / NEW QUADRAJETS
« Last post by qjetsrule on December 04, 2021, 12:03:51 PM »
A follow up on 73ss's post. I searched NEW QUADRAJETS on ebay motors and got this.

https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2047675.m570.l1313&_nkw=NEW+QUADRAJET&_sacat=0
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Quadrajet Carb Talk and Tips / Re: Remanufactured Carburetors
« Last post by Pav8427 on December 04, 2021, 11:55:26 AM »
If you google it, there is another well know quad guy that broke one of them new ones down and dynoed it. Good pics and stuff to make them work kinda like they are supposed to.
For the price would be better to find a clean core to re do.
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Quadrajet Carb Talk and Tips / Re: Remanufactured Carburetors
« Last post by qjetsrule on December 04, 2021, 11:43:20 AM »
Thanks for the post 73ss. I had no idea this was available.
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