Edelbrock - which one? 1406?
Thread Starter
Drifting
Joined: May 2005
Posts: 1,909
Likes: 6
From: Lake Arrowhead - Georgia > 72 Base Coupe & 74 BB Roadster
Edelbrock - which one? 1406?
I actually prefer a Q-Jet - but I am tired of fighting with this car. 
Which model # Edelbrock Performer will easily bolt on AND FIT under
the stock hood with the stock air breather on a 72 base 350?
600 cfm or 750 cfm ?
Stay with the divorced choke or convert to the electric choke?
Any 1st hand experience appreciated........
Which model # Edelbrock Performer will easily bolt on AND FIT under
the stock hood with the stock air breather on a 72 base 350?
600 cfm or 750 cfm ?
Stay with the divorced choke or convert to the electric choke?
Any 1st hand experience appreciated........
Last edited by fotyfobravo; Dec 13, 2008 at 03:48 PM. Reason: spelling
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,445
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
I used the 750 EDL on my hot 355 ci motors with a single plane. I have a 351 mustang friend that bought the 600 and wanted it dialed in so I worked on it and installed it on my Vette for testing. I actually kind of liked it better
My advice is to get a Weiand Stealth intake and a 600
Mine came with the electric choke. It might have worked for first three years and I got tired of it dorking up and removed the choke
My advice is to get a Weiand Stealth intake and a 600
Mine came with the electric choke. It might have worked for first three years and I got tired of it dorking up and removed the choke
Last edited by gkull; Dec 13, 2008 at 08:37 PM.
Drifting
Joined: Apr 2007
Posts: 1,970
Likes: 45
From: Cameron Park CA
Electric vs. Divorced Choke
I have an electric choke on my Holley, because the heads don't have an exhaust crossover passage. It works just fine for me but there are some drawbacks. The major one is that they cool off more quickly than a choke with a heat source on the intake manifold. So sometimes, depending on conditions, if you restart while the engine is still warm, the choke will come on when it isn't needed - it doesn't sense the engine heat. They also go off if you have the ignition on and don't start right away unless, you have the 12v. source run through a switch that is activated by oil pressure.
If you have an intake manifold with exhaust crossover heat, like they came from the factory, I would stick with a divorced choke. Just my 2¢.
If you have an intake manifold with exhaust crossover heat, like they came from the factory, I would stick with a divorced choke. Just my 2¢.
Melting Slicks
Joined: Mar 2006
Posts: 2,465
Likes: 0
From: Orange Park Fl
I actually prefer a Q-Jet - but I am tired of fighting with this car.
Which model # Edelbrock Performer will easily bolt on AND FIT under
the stock hood with the stock air breather on a 72 base 350?
600 cfm or 750 cfm ?
Stay with the divorced choke or convert to the electric choke?
Any 1st hand experience appreciated........
Which model # Edelbrock Performer will easily bolt on AND FIT under
the stock hood with the stock air breather on a 72 base 350?
600 cfm or 750 cfm ?
Stay with the divorced choke or convert to the electric choke?
Any 1st hand experience appreciated........
God bless, Sensei
Race Director
Joined: Sep 2002
Posts: 10,362
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From: San Diego - Deep Within The State of CONFUSION!
Race Director
Joined: Aug 2004
Posts: 10,628
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From: Duvall, WA
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Burning Brakes
Joined: Nov 2006
Posts: 1,125
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From: Flower Mound TX.
I actually prefer a Q-Jet - but I am tired of fighting with this car.
Which model # Edelbrock Performer will easily bolt on AND FIT under
the stock hood with the stock air breather on a 72 base 350?
600 cfm or 750 cfm ?
Stay with the divorced choke or convert to the electric choke?
Any 1st hand experience appreciated........
Which model # Edelbrock Performer will easily bolt on AND FIT under
the stock hood with the stock air breather on a 72 base 350?
600 cfm or 750 cfm ?
Stay with the divorced choke or convert to the electric choke?
Any 1st hand experience appreciated........
The eng has a mild cam, MSD ignition, 30 over, Stock heads and a few other little things. I had a Demon Carb before the Edelbrock. The car runs so much better with the Edelbrock but, some people don't like the Edelbrocks.
Burning Brakes
Joined: Dec 2003
Posts: 1,004
Likes: 7
From: Adelaide South Australia
I had an 800cfm AVS #1813 and could NOT get it to run well with my 383. Off idle hesitation and splutter when cornering hard.
I've since heard of this is a prevalent issue on the larger edelbrocks... but isn't as bad with the smaller cfm carbs.
Just some real world feedback for you.
Currently running a Holley 750 street HP carb without problems.
dyno results of same engine with both setups had edelbrock providing about 4~5hp more to about 4600, but Holley then produced an additional 15hp > 5000 rpm. I think the lower bottom end with Holley probably due to secondaries opening imediately (mecanical) whereas edelbrock still requires air velocity to open secondaries... hence slightly better bottom end... But on the road, I could NOT eliminate the stumbles.. off idle and cornering
tom
I've since heard of this is a prevalent issue on the larger edelbrocks... but isn't as bad with the smaller cfm carbs.
Just some real world feedback for you.
Currently running a Holley 750 street HP carb without problems.
dyno results of same engine with both setups had edelbrock providing about 4~5hp more to about 4600, but Holley then produced an additional 15hp > 5000 rpm. I think the lower bottom end with Holley probably due to secondaries opening imediately (mecanical) whereas edelbrock still requires air velocity to open secondaries... hence slightly better bottom end... But on the road, I could NOT eliminate the stumbles.. off idle and cornering
tom
Race Director
Joined: Aug 2004
Posts: 10,628
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From: Duvall, WA
Here's a quote from Cliff Ruggles, on his experience with the Edelbrock carbs. Cliff has a carb shop, races a Pontiac and wrote a book on the Quadrajet...
The Edelbrock carb on my Pontiac performs as he described. I'll be replacing it with a Q-Jet as soon as it returns from Cliff.
We obtained and tested two Edelbrock 750 AFB "clones" here several years ago. We found them relatively easy to tune, and they performed fine on the primary side of the carburetor.
However, they were horrible when the throttle was quickly depressed. The engine stumbled, hesitated, bogged, and/or backfired anytime we went to full throttle. The slower the engine and vehicle speed, the worse the problem(s). They were fine once you got passed the "transition", and pulled hard to the shift point.
I tried "tuning" them by increasing jetting, pump shot, etc, no improvement. I finally gave up. Lacking any adjustment for the weighted secondary airflap is a BIG showstopper for those units. They simply lack any flexibility.
I would add that one of them was installed/tested on a Chevy pick-up with a pathetically anemic 350 engine, huge tires, stock converter, poor gearing etc. It worked FLAWLESSLY. My assumption is that Edlebrock set them up for smaller engines being used in conservative applicatoins, NOT for high HP to weight ratio set-ups?.......Cliff
However, they were horrible when the throttle was quickly depressed. The engine stumbled, hesitated, bogged, and/or backfired anytime we went to full throttle. The slower the engine and vehicle speed, the worse the problem(s). They were fine once you got passed the "transition", and pulled hard to the shift point.
I tried "tuning" them by increasing jetting, pump shot, etc, no improvement. I finally gave up. Lacking any adjustment for the weighted secondary airflap is a BIG showstopper for those units. They simply lack any flexibility.
I would add that one of them was installed/tested on a Chevy pick-up with a pathetically anemic 350 engine, huge tires, stock converter, poor gearing etc. It worked FLAWLESSLY. My assumption is that Edlebrock set them up for smaller engines being used in conservative applicatoins, NOT for high HP to weight ratio set-ups?.......Cliff
Le Mans Master
Joined: Apr 2006
Posts: 5,403
Likes: 95
I'm a holley person but the edelbrock catalog says the 1406 is calibrated for fuel economy, sounds set up pretty lean to me, may want to consider the 650 AVS calibrated for performance, manual choke #1825, elecric choke # 1826
Last edited by Little Mouse; Dec 14, 2008 at 02:10 AM.
Drifting
Joined: Jul 2002
Posts: 1,944
Likes: 20
From: The only Corvettes in Highett Victoria
Fuel line
In2Fun,
I'm intrigued by your fuel line to the carb. The photo shows it coming up from the driver's side of the timing cover and crossing over to the passenger side carb intake. How have you got your lines from the fuel tank plumbed?
Regards from Down Under
aussiejohn
8 months to go
I'm intrigued by your fuel line to the carb. The photo shows it coming up from the driver's side of the timing cover and crossing over to the passenger side carb intake. How have you got your lines from the fuel tank plumbed?
Regards from Down Under
aussiejohn
8 months to go
Le Mans Master
Joined: Sep 2001
Posts: 7,739
Likes: 630
From: Unreconstructed, South Carolina
EB 1406 is a square bore carb & will not fit an OE 72 base 350 ... all EB14xx series are based on carter afb with square bore flange to fit squarebore intake. All Qjet have spreadbore flange. Those EB 14xx series won't fit any car that came OE w/ Qjet carb with spreadbore flange to fit spreadbore intake. The two flanges/bases do NOT fit interchangably. Vast majority of C3 came with Qjet; including 72 base 350. Yes you can get an adapter to sandwich between carb & OE intake or a buy a new intake.
Vast majority of Holley also square bore ... there's only one or two p/n w/ spreadbore flange.
Suggest send Qjet out to pro for rebuild.
Vast majority of Holley also square bore ... there's only one or two p/n w/ spreadbore flange.
Suggest send Qjet out to pro for rebuild.
Last edited by jackson; Dec 14, 2008 at 12:14 PM.
Le Mans Master
Joined: Apr 2006
Posts: 5,403
Likes: 95
Really dont understand why edelbrock just because someone wanted an electric choke give them a leaned down fuel economy carb
Melting Slicks
Joined: Apr 2002
Posts: 2,337
Likes: 14
From: Norfolk VA
I have a 1406 sitting atop my vette w/2101 manifold. I also have a new in the box mighty demon and a stealth intake. I don't like my edelbrock. I will put my demon on the 383 I have never gotten around to building (smile)
Thread Starter
Drifting
Joined: May 2005
Posts: 1,909
Likes: 6
From: Lake Arrowhead - Georgia > 72 Base Coupe & 74 BB Roadster
UPDATE....First, Thanks for all the info and advice. This forum is the best place for help I have ever seen.
On Sunday, I put 3 Carbs on my 72 base 350.
1. One Q-J rebuild that was the problem to start with....it was a great carb for sometime and is the original factory carb....wouldn't idle and was very rich no matter what adjustments.
2. A brand new SummitRacing.com rebuild - right out of the box....part # 210210....the 2 idle jets on front had NO EFFECT on the carb. Would not idle no matter what. Took back to Summit.
3. On the shelf of my basement was a Qj that I took off my 70 GMC 1500 - 350/300. This carb has sat there since 1996 when I rebuilt the GMC with an Edelbrock. I installed the old nasty carb right off the shelf onto the 72 Vette. It started up as soon as the bowl filled up. I set the idle ....set both mix screws on 3 turns out. Idles and runs strong and smooth all the way to 6000 rpm. No rich fuel smoke...no leaks...
Like most have said...QuadraJets...work GREAT or not at all.
On Sunday, I put 3 Carbs on my 72 base 350.
1. One Q-J rebuild that was the problem to start with....it was a great carb for sometime and is the original factory carb....wouldn't idle and was very rich no matter what adjustments.
2. A brand new SummitRacing.com rebuild - right out of the box....part # 210210....the 2 idle jets on front had NO EFFECT on the carb. Would not idle no matter what. Took back to Summit.
3. On the shelf of my basement was a Qj that I took off my 70 GMC 1500 - 350/300. This carb has sat there since 1996 when I rebuilt the GMC with an Edelbrock. I installed the old nasty carb right off the shelf onto the 72 Vette. It started up as soon as the bowl filled up. I set the idle ....set both mix screws on 3 turns out. Idles and runs strong and smooth all the way to 6000 rpm. No rich fuel smoke...no leaks...
Like most have said...QuadraJets...work GREAT or not at all.
Last edited by fotyfobravo; Dec 15, 2008 at 08:41 PM.
Melting Slicks
Joined: Apr 2002
Posts: 2,337
Likes: 14
From: Norfolk VA
Chevy installed 750 cfm q-jets on 350 engines they ran fine. Holley ran an 850cfm carb on the '70 LT-1.