choosing the right carb
11-15-2015, 08:08 PM
#1
choosing the right carb
Hello folks 
the new bad boy coming on its way to his new home
it will arrive this week hopfully
i'll post another thread when it gets here
any way, there is this one thing if you guys can help me with it
i was thinking about buying a new holly carburetor
Any recommendation which holly i should get? + the intake that will go with it the best
the engine is
1969 427 heads on a 454 block correct era 4 bolt main
block was bored 30 over 9.75 cr pistons stock crank 10/10 milling clevite 77 bearings milidon oil bump ,headers, hei distributor
4 speed bw t-10 1975 tans.
rear end was completely rebuilt by savannah driveline 3:08 ratio all new correct mounting hardware and u joints and a new drive shaft.
cam specs are unknown unfortunately the previous owner didn't mention it to me
i'm going to put headers with a straight pipe and some magnate rear cats
its not going to be a race car , but it gotta be fast it's a corvette! haha
any help would be appreciated
the new bad boy coming on its way to his new home
it will arrive this week hopfully
i'll post another thread when it gets here
any way, there is this one thing if you guys can help me with it
i was thinking about buying a new holly carburetor
Any recommendation which holly i should get? + the intake that will go with it the best
the engine is
1969 427 heads on a 454 block correct era 4 bolt main
block was bored 30 over 9.75 cr pistons stock crank 10/10 milling clevite 77 bearings milidon oil bump ,headers, hei distributor
4 speed bw t-10 1975 tans.
rear end was completely rebuilt by savannah driveline 3:08 ratio all new correct mounting hardware and u joints and a new drive shaft.
cam specs are unknown unfortunately the previous owner didn't mention it to me
i'm going to put headers with a straight pipe and some magnate rear cats
its not going to be a race car , but it gotta be fast it's a corvette! haha
any help would be appreciated
11-15-2015, 09:11 PM
#3
Drifting
11-16-2015, 06:42 AM
#4
Team Owner
Why do you want to replace the carb on a car you have yet to use? Contrary to most folks perception, 'carb replacement' does not provide that much of a performance improvement...except where the present carb is not functioning properly or is (by design) a bad mis-match with the engine.
If the car runs well, you would be better advised to tune the existing carb and get the choke, etc. working properly.
Just throwing a "new" carb on the car is usually just a waste of time and money.
If the car runs well, you would be better advised to tune the existing carb and get the choke, etc. working properly.
Just throwing a "new" carb on the car is usually just a waste of time and money.
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TeaEye (12-27-2015)
11-16-2015, 11:41 AM
#5
Race Director
Member Since: Mar 2003
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Your question is a loaded one and almost each person will have their favorite brand or some reason why this or that carb sucks and not in a good way.
But of the big carb builders all can be made to work, some better than others with less hassles.
If you have the toad pelts ( I dont ) EFI is the way to go...
Since you didn't mention why you want a new carb I will respect your desire to have a new one, I feel that same way and have seen too many cats waste too much time putzing with an old unknown carb and then grab a new one and the car performed better, time and money well spent.
In my case I plan to run the super popular holley 3310 on my 69 with mild ( lol ) 454 for lots of valid reasons ranging from I just want to try this holley to believing my Edelbrock carb that is on there is a hair on the small side.
In your case if you have the rectangle port heads and plan a lot of high rpm stuff you might even take a look at an 850
But of the big carb builders all can be made to work, some better than others with less hassles.
If you have the toad pelts ( I dont ) EFI is the way to go...
Since you didn't mention why you want a new carb I will respect your desire to have a new one, I feel that same way and have seen too many cats waste too much time putzing with an old unknown carb and then grab a new one and the car performed better, time and money well spent.
In my case I plan to run the super popular holley 3310 on my 69 with mild ( lol ) 454 for lots of valid reasons ranging from I just want to try this holley to believing my Edelbrock carb that is on there is a hair on the small side.
In your case if you have the rectangle port heads and plan a lot of high rpm stuff you might even take a look at an 850
11-16-2015, 11:55 AM
#6
Pro
Whatever carb you decide on, get it with annular boosters. Car Craft magazine did a dyno test between annulars and downlegs carbs and in the low end range a 90 ft. lb torque increase was had on the dyno. That is real noticeable power. I have em on my 750 mech secs Mighty Demon carb.
11-16-2015, 05:10 PM
#8
Melting Slicks
11-16-2015, 07:03 PM
#9
Burning Brakes
11-16-2015, 08:20 PM
#10
Why do you want to replace the carb on a car you have yet to use? Contrary to most folks perception, 'carb replacement' does not provide that much of a performance improvement...except where the present carb is not functioning properly or is (by design) a bad mis-match with the engine.
If the car runs well, you would be better advised to tune the existing carb and get the choke, etc. working properly.
Just throwing a "new" carb on the car is usually just a waste of time and money.
If the car runs well, you would be better advised to tune the existing carb and get the choke, etc. working properly.
Just throwing a "new" carb on the car is usually just a waste of time and money.
and since i'm changing it, i thought i would ask you guys what is the one that would be ( enough ) for what i have. for instance, i don't want a 950 cfm when the 750 is gonna be enough
by the way i'm planning on buying a cam
even tho the car sounds cammed and the headlights don't have enough vacuum . i'll have to contact the guy i bought it from to try and see what cam on it.
so the one i was looking at is the 770 CFM STREET AVENGER 0-80770
well its not gonna be a waste of time because i live working on them.
Your question is a loaded one and almost each person will have their favorite brand or some reason why this or that carb sucks and not in a good way.
But of the big carb builders all can be made to work, some better than others with less hassles.
If you have the toad pelts ( I dont ) EFI is the way to go...
Since you didn't mention why you want a new carb I will respect your desire to have a new one, I feel that same way and have seen too many cats waste too much time putzing with an old unknown carb and then grab a new one and the car performed better, time and money well spent.
In my case I plan to run the super popular holley 3310 on my 69 with mild ( lol ) 454 for lots of valid reasons ranging from I just want to try this holley to believing my Edelbrock carb that is on there is a hair on the small side.
In your case if you have the rectangle port heads and plan a lot of high rpm stuff you might even take a look at an 850
But of the big carb builders all can be made to work, some better than others with less hassles.
If you have the toad pelts ( I dont ) EFI is the way to go...
Since you didn't mention why you want a new carb I will respect your desire to have a new one, I feel that same way and have seen too many cats waste too much time putzing with an old unknown carb and then grab a new one and the car performed better, time and money well spent.
In my case I plan to run the super popular holley 3310 on my 69 with mild ( lol ) 454 for lots of valid reasons ranging from I just want to try this holley to believing my Edelbrock carb that is on there is a hair on the small side.
In your case if you have the rectangle port heads and plan a lot of high rpm stuff you might even take a look at an 850
i don't like my old one either that's another reason to get a new one.
the 3310 is a great one
i like the 80770 one reason is that it has secondary metering plates. And my buddy is a great tuner and he told me that this would be better.
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1970-Stingray (11-18-2015)
11-18-2015, 12:33 AM
#15
Melting Slicks
Just sayin'
Last edited by Kid Vette; 11-18-2015 at 12:40 AM.
11-18-2015, 01:42 AM
#16
You say the carb is stock. Does that mean it's a QuadraJet? That would mean you have a spreadbore manifold. These are the only Holley carbs that will bolt to a spreadbore manifold and work well with that engine. FS: 2 Holley 800 cfm Spreadbore Carbs
Just sayin'
Just sayin'
I am sure what you are saying is right. The thing i'm not sure about is what carb is on it but the guy who i bought from said it is stock. anyway i'll have to wait for it to be here first
BUT maybe you didn't notice that i also said that i want the carb and the intake manifold
11-18-2015, 11:23 AM
#17
Race Director
Member Since: Mar 2003
Location: Eustis ( Area 51 Bat Cave ) Fl
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yes sir
I am sure what you are saying is right. The thing i'm not sure about is what carb is on it but the guy who i bought from said it is stock. anyway i'll have to wait for it to be here first
BUT maybe you didn't notice that i also said that i want the carb and the intake manifold
I am sure what you are saying is right. The thing i'm not sure about is what carb is on it but the guy who i bought from said it is stock. anyway i'll have to wait for it to be here first
BUT maybe you didn't notice that i also said that i want the carb and the intake manifold
So when you get past the cats telling you keep what you and etc
The main thing you need is a bit more info as in which heads you have will make a difference, oval port or rectangle port, very different creatures made for different RPM power bands.
As far as pulling the old carb just to save it I would have to say that in and of itself is a waste of $$$ you are modding the car anyway having the old carb in a box will only soothe a purist would be buyer so much.
11-18-2015, 01:16 PM
#18
Dr. Detroit
Member Since: Mar 2012
Location: New Braunfels Texas
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3310 is an excellent choice.....best bang for the buck out there...
But as others have said....why do you need a new one?
And as far as annular boosters go....one only sees big gains on a low vacuum motor with bad signal.....
Holley will not recommend a Vac Sec for a stick....but it still works very well if the secondary spring is lightened up to account for the fast increase in RPM under a load in first gear.
I have heard a LOT of good things about Quick Fuel....but have never tried one.....they are kinda pricy...but all tuner carbs are.
If cost is no object....go with Patrick at Pro Systems.....
This is my opinion...based on years of screwing around...and your results may vary!
Jebby
But as others have said....why do you need a new one?
And as far as annular boosters go....one only sees big gains on a low vacuum motor with bad signal.....
Holley will not recommend a Vac Sec for a stick....but it still works very well if the secondary spring is lightened up to account for the fast increase in RPM under a load in first gear.
I have heard a LOT of good things about Quick Fuel....but have never tried one.....they are kinda pricy...but all tuner carbs are.
If cost is no object....go with Patrick at Pro Systems.....
This is my opinion...based on years of screwing around...and your results may vary!
Jebby
11-18-2015, 01:35 PM
#19
Team Owner
Edelbrock
On my car I have had a Demon 750 a Holley 650 and currently an Edelbrock 600. The Edelbrock is by Far my favorite carburetor hands down. Could be how it "fits" with my complete Set-up
11-18-2015, 01:35 PM
#20
Team Owner
Member Since: Oct 2004
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St. Jude Donor '05
He could probably get away with a vacuum secondary on it esp with those gears;(not sure Id call the car light)plenty of performance cars came with vac secondarys back then.... Personally I like a double pumper on stick cars...actually most hot rods period. Personal choice
toobroketoretire just cant catch a break...he says DP you guys tear him up, VS same thing. Wow
toobroketoretire just cant catch a break...he says DP you guys tear him up, VS same thing. Wow
Last edited by cv67; 11-18-2015 at 01:36 PM.
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1970-Stingray (11-18-2015)