Edelbrock 650 -vs- Holley 650 carburetors??

N

NYH1

Member
grumpy, I posted this on a few other sites. I really want to get your opinion on this.

Some of you might recall my dislike for Holley's customer service. And that I even said I won't buy their products anymore. With that being said, I built a mild 385 stroker motor. I want the best compromise between drivability, tunability, economy and performance I can get out of a carburetor. I'm building a daily driver that will be driven a lot. It's not going to be a garage queen.

I'm using Summit Vortec heads, Edelbrock Vortec non-Air Gap RPM intake, my compression ratio's are SCR 9.1 and DCR 7.93, I'm using a Lunati Voodoo 262/268 Hydraulic Flat Tappet Cam, 219/227 dur. @.050", .468/.489 lift, 112LSA 1400-5800 RPM range in a 350 PT# 60102, 1 5/8" full length headers and a 2 1/2" Flowmaster dual exhaust system. Going to use a 2000 RPM converter and 3.42 gears.

Which of these two 650 CFM carburetors do you think will work the best, THIS ONE or THIS ONE. I have a nice drop base air cleaner and a few other accessories for Holley carburetors.
 
If limited to only those two choices,
http://www.summitracing.com/parts/HLY-0-80783C/

BECAUSE ,its been my experience that HOLLEY carbs are both easier to tune correctly and easier to get parts for, but keep in mind that the carb you select is also matched to the intake and displacement and cam used etc., you don,t select just a carb, you'll want to select an intake system that meets the engine requirements, theres not a darn thing wrong with a properly tuned carb from either manufacturer, and its been my experience that the edelbrocks are fairly close, to being tuned correctly as the come out of the box, but the holley carbs are far easier to get tuned just right for a particular application and generally run a bit better once you tweak them to get the last 5% of potential, personally ID have selected a vacuum secondary 750cfm holley, the difference will not be anything major but a 750 cfm has a bit more high performance potential and more resale value, and from what Ive seen similar low rpm performance, remember the vacuum secondaries will only flow whats required

read these

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viewtopic.php?f=55&t=1961

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viewtopic.php?f=44&t=392

viewtopic.php?f=44&t=1788

viewtopic.php?f=44&t=773

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viewtopic.php?f=55&t=635
 
The Holley 3310 is my favorite carburetor, I used to run one on my 406 in my last Camaro.

My current 385 should make around 350 HP and 425/450 FT. LBS. of torque. I'm not going to turn more then 5800 RPM. Do you think the 750 vacuun secondary carb (3310) will work on my motor?
 
a 750 holley with vacuum secondaries, is about as close too a UNIVERSAL use almost on any 327 SBC or larger, engine, carb ever designed
I use them and have very good results on almost every sbc and almost all V8 engines under 427 displacement that I build.
Ive also used lots of similar size demon carbs.
you really can,t go far wrong with a 750cfm HOLLEY or DEMON carb, just ask the tech guys at either company for the correct carb, for your application, but even 725-780cfm HOLLEY or DEMON carbs not specifically designed for the application will have a great deal of tuning flexibility




theres bits of info in these threads

viewtopic.php?f=55&t=2994&p=7857&hilit=+dual+quads#p7857

viewtopic.php?f=55&t=444&p=5682&hilit=+dual+quads#p5682

viewtopic.php?f=55&t=2739
 
On the 3310 carb's do you recommend using the secondary metering plate that comes with it, or changing it to another metering plate that works with your set up? Or do you recommend changing from the metering plate altogether to a secondary metering block so jets can be used instead?
 
before you start thinking about making changes why not, at least see how the carb runs and what if anything NEEDS changing?
in most cases a few jet changes or swapping power valves or adding a different accellerator pump or accellerator pump cam will get the carb running just fine.
obviously you can dump a ton of parts and cash into this but in most cases its NOT required!
 
I called Holley today (they actually answered the phone!). I asked them which carburetor I should use. I didn't say anything about a specific carburetor. I told the guy what I built for a engine, he asked me a few questions and then recommended these two 650 vacuum secondary carburetor. http://holley.com/0-80783C.asp and http://holley.com/0-80670.asp . Both have electric chokes, which I want.

Demon recommended I use one of their Speed Demon 750 vacuum secondary carburetors.
 
Grumpy, would you recommended the 80783 over the Street Avenger 670? I do like the fact that the 80783 has the traditional finish instead of shiny. I also like that it's been around forever. But the 670 has a quick change setup for the VS spring, as well as clear sight plugs. Are there any internal differences?

I just sold a perfectly fine Edelbrock 1405 that was on my 327 (street-only 55 Chevy sedan, Muncie M20, soon to be 3.08 gears) because I want to try something different. Had been thinking about a 600DP and got some great tuning info from Greg over on the CT Performance forum, but in reality I'm probably better off with vacuum secondaries. I'm looking at the two VS carbs above because Holley doesn't make a 600 VS in the 4150 style.

Thanks for your comments.
 
http://www.amazon.com/Holley-0-80783C-4 ... B00062ZM0K

http://garage.grumpysperformance.co...recting-a-rich-edelbrock-carb.1820/#post-4706

http://garage.grumpysperformance.com/index.php?threads/edelbrock-carb-rebuild-related.15406/

holley650.jpg

1403-E11.jpg


I don,t know if its been just extremely good luck or skill or long term familiarity , but Ive generally found almost all of the 650,750,850 Holley carb that look similar to this one to be rather easy to tune and modify, and Ive tuned enough edelbrocks on mostly dual quad applications to be very comfortable with those so I thing your choice is mostly on what you prefer to work with, the edelbrock carbs tend to be fairly easy to tune, and reasonable close right out of the box in many applications but Ive always found a tiny bit more hp in the Holley carbs

viewtopic.php?f=55&t=109

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Just wanted to say I bought that Holley 0-80783 650 vacuum secondary carb ($273 + free shipping at Amazon.com!) and installed it on my 55 sedan's 327 several weeks ago. I installed the carb right out of the box and didn't touch anything except mixture and idle speed screws. Compared to the Edelbrock 1405 600cfm carb, the Holley is just as well mannered at part throttle, lets the engine start quicker hot and cold, and gives my engine noticeably more punch when I stomp on the gas at 2500 RPM. And I don't think that has anything to do with it having 50 cfm more air flow, since the secondaries are nowhere near fully opened at 2500-4500 RPM.

I did have a problem on a 100 degree day where the idle speed would drop down so low that sometimes the engine would die when bringing the car to a stop. Since it would fire right up and work OK until the next stop, I decided it wasn't vapor lock and checked the float levels. Sure enough, they were both low. My bad. :roll:
(What a PITA to set those floats!)

Down the road I may see if I can lean out the primary jets by one size w/o incurring hesitation or surge. With my current cam, the engine makes around 15" vacuum which I guess is a good fit for the 6.5 power valve, but I may try an 8.5 when I go to a smaller cam. By the way, the transition to secondaries is very smooth, so I don't plan to touch the springs.
 
Im glad your having good luck with the HOLLEY carb, Ive always preferred HOLLEYS in most similar applications,
If you can post very clear pictures of your spark plugs, labeled as to the cylinder number, can indicate a great deal about conditions and temp range in the engines combustion chambers
 
Regarding the plugs, how I should I drive the car before pulling them? I can't go faster than 30 for the last 1/2 mile before my garage, so should I keep the revs up?
 
why fight a hot engine or take a chance on burnt fingers, Ive read spark plugs for 40 years I can get a bit of useful info as they sit currently don,t bother even driving it again, just pull them in the current condition and post clear pictures
 
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