I ask this because I'm needing a carb for my truck. I just did get a new Holley (for those of you following my other post) but it's pretty much for the Chevelle.

This truck is a daily driver and will see some strip duty from time to time. It used to have a 650 cfm Holley and it went south so I replaced it with a 600 Holley....lost some performance but now I'm considering stepping up to at least a 650....Holley only has a limited selection of these but I see Edelbrock has a few.

What I like about the Edelbrock is their universal design to fit both squarebore and spreadbore manifolds and plus from what I've gathered they're pretty much a bolt on and go style carb, which is why I'm wondering how well they do performance-wise?

I'd use it on the truck,had one on my 454 for a while,they are a good all around carburetor,but in the performance dept. won't hold a candle to the 950HP. smile.gif

What about a 750 cfm Eddy vs. a 750 Holley if both were vac. secondary carbs?

I had an Edlebrock 600 on my 355 for a while, and was able to get 13.20's out of it. I went to a Holley 750 and it made more power, but I had to dial it in first. The 600 should work well for you.

The Edelbrock should perform fine...

It is still a performance carburetor, just maybe not the best for all-out performance, but I think a better all-around street carb...

I have known several people that have switch from Holley to Edelbrocks (the regular performer style) and either ran quicker in the 1/4 mile, or about the same... They all ran well "out-of-the-box", and only one guy had any problems (I know far more people that have headaches trying to initially sort out their Holleys)...

I even run two Edelbrock 600s on my 396 in my Chevelle (dual quad). The car fired up and ran with those carbs right out of the box on a new engine...

Don't get me wrong, these were street cars (most don't hook all that great) and not set up for all out racing, but they did run from the high-12s to the low-14s.

every one of those people were thoroughly satisfied with the Edelbrocks (except that one guy).

My best friend has a 66 Mustang with a small B&M blower. His car was running 12.90's with a Barry Grant Carb (4-corner idle, milled choke housing, etc) that he had professionally tuned (by an actual "carburetor" shop). The car ran fine around town too, but had really bad mileage. He switched to the Edelbrock, and with only basic tuning (just the idle circuits, no rod/yet changes), the car still ran 12.90s (and actually yielded his best time ever), ran great around town AND increased his mileage noticibly.


As a final thought, the Edelbrocks are based on the old Carter design, and weren't the Carters used on dual quad 409's and street Hemi's? Sure Chrysler used the Holleys on the Race Hemi's, but the Carters on the Street Hemi's... If these were "non-performance" carbs, would they had done that?


I'd run the Edelbrock...

I'd use an Edelbrock for the daily driver for sure. You can lean them out in the cruise mode by just a simple rod change, for better fuel economy, if you give a hoot that is, :D .

Also, there's really nothing that can wear out them. All fuel is below any gasket, so no leaks too. graemlins/thumbsup.gif

i have an edlebrock perfromer 750cfm carb on my 70 camino with a 402. works fine. always starts. car sits for 6 months over the winter. crank the starter for 30 seconds to draw gas up the line, pump it 3 times and away you go.

the only problem i ever noticed is that when it is warm and humid outside i get a slight stumble getting back into the throttle. i have adjusted the idel mixture screws a bunch of times and made it better but every once in a while it still happens. other than that i like it.

I had the 750cfm #1407 on my truck for awhile, the only thing I didn't like was how it flooded its self on good grades/hills while out playing. They do sell a kit to fix it, for like $8... of course I found this out after I sold the carb and bolted a Q-Jet back on... doh!

Imho, you just can't beat for a daily driver, the great old STOCK Q-Jet!!!

Just get a good one that is from a motor that is about your size and go from there.

(I.e., 305" = 305 motor Q- Jet, and 400" motor = a 400" motors Q-Jet sorta thing!!))))))

I bought a Delco rebuilt one years ago for my 406 that was spec'ed for a 403 Olds if not mistaken b/c I didn't know the 400 SB's even came with Q-Jets on them at that time way back then AND it ran great!!!

pdq67

the only problem i ever noticed is that when it is warm and humid outside i get a slight stumble getting back into the throttle. i have adjusted the idel mixture screws a bunch of times and made it better but every once in a while it still happens. other than that i like it.Our '70 'vert 396 has one of these carbs (750 Edelbrock), and it does the exact same thing! I have tried everything, and I cannot tune out this slight tip-in stumble.

Anyone have advice?

BTW, Dad claims he got 17-18 mpg driving from Pittsburgh to the Can-Am Chevelle meet. Not bad for a 396/TH350/3.08 combo. I think I have the part throttle calibration dialed in pretty nicely! smile.gif I needed to go about 8% lean compared to out-of-the-box setting to get it to run it's best on this particular motor.

Originally posted by novadude:
</font><blockquote>quote:</font><hr />the only problem i ever noticed is that when it is warm and humid outside i get a slight stumble getting back into the throttle. i have adjusted the idel mixture screws a bunch of times and made it better but every once in a while it still happens. other than that i like it.Our '70 'vert 396 has one of these carbs (750 Edelbrock), and it does the exact same thing! I have tried everything, and I cannot tune out this slight tip-in stumble. </font>[/QUOTE]Same here, with a carter 600cfm on my daily. Edelbrock/carter carbs are good carbs for daily driving, but I don't like them for performance. Went from a carter afb to a speed demon on my stroker and gained power everywhere.

Novadude,

You should try their off road needle and seat. Basically, the difference is a little spring in th n&s that keeps the floats down in the bowls. If you ever get on the brakes hard, and the car wants to stall, this will solve that problem also. They should all come that way from the factory, but they don't. :rolleyes:

Mark... this is just a real slight tip-in issue, just off idle. Do you think the float kit would help this issue? I was kind of thinking that it would be a problem with the idle circuits.

Has this worked for you in the past to sure a VERY minor off-idle stumble? Thanks for the tip.

Good for daily drivers that don't hold performance in high regard.

I have witnessed two engines that had Edelbrock Performer RPM 750's replaced with Holley 650DP's.
They both picked up.One was a 355 and the other was a 406.
The 355 was built with a CompCams 280 Magnum and ported 202/160 valved 461 heads.
The 406 was built with a CompCams 292Magnum and ported 202/160 valved 186 heads.
Both had 4.10 gears and TCI 10inch 3500 stall converters.

Nova,

So the car kind of stumbles when you giving it gas from idle? I'd mess with the accelerator pump shot. There are three holes in the arm that activates the pump, the highest hole give you the quickest shot of fuel, the bottom, the slowest. And they can make a world of a difference if it's in the wrong hole. I had mine in the middle hole, and it would stumble bad, from being to lean, changed it to the top hole, and it was a whole different car.

I personally don't buy the claim that they can't be used for performance. :D

Oh don't get me wrong, they can be.
But you would be quicker with something else.

I always hear that, never hear a convincing answer as to why.

Here's a good read, pay special attention to odb's post, graemlins/thumbsup.gif .

http://www.camaros.net/forum/ultimatebb.php?ubb=get_topic;f=4;t=002763;p=1

I've got an edel 600 with that tip in stumble too, some more initial timing and adjusting the pumpshot rod to give the max fuel got rid of it.

graemlins/thumbsup.gif Good read to be sure.
I really didn't see anything that convinced me otherwise.

I do know one guy that paid insane money to a shop to have a Thremoquad modified and tuned to his BB Buick.
After a couple of years of playing with it he switched to a Holley and has never looked back.Now running quicker, no other mods.

I think just like the Camaros.com post, this will always be debated... OBDs post were good reading...

We all (well, alot of us) have experienced "faulty" carbs, and that often clouds our judgements of the entire product line as a whole...

I do find that "die hard" Holley fanatics seem to be less inclined to see the other side... While many Edelbrock owners (and some Holley people) still seem to feel a Holley is better for "All Out" performance.

Even I still think Holley is the way to go for "all-out" performance. But if your traction is limited like most street cars, you have smaller tube headers or really anything that doesn't maximize the rest of the car, a properly tuned carb of either brand will not significantly outperform the others. For a true street car (where pure acceleration is not the only variable), then the Edelbrocks are really better all-around carbs.

Its kind of ironic when someone switches not only the type, but the size of carb and then talks about the increase/decrease in performance... One of the carb choices was obviously wrong for the application...

I used to see it all the time, people with "street" cars running DPs when they weren't warranted... They would increase the secondary pump shot to make the car "appear" to be performing better... I had a buddy that swore that because the DP gave him a "kick in the pants" that it performed better... He was proved wrong by an older racer that not only tuned his DP, but switched and tuned a VC that outperformed the DP, even thought the secondaries transitioned also seemlessly... Again, a street car that couldn't utilize Full throttle all the time...

Lets face it, Most people are more familiar with one of the other when it comes to tuning... Therefore they may be able to tune "Brand A" really well, but get frustrated with trying to tune "Brand B"...

I know myself, its been a few years since I have tuned a Holley (the last 4-5 carbs I fooled with were Edelbrocks)... I am now trying to recall my Holley knowledge to help tune my friends 750 DP on his 454. We are contemplating switching to a 600 VC since he only likes to cruise it around and will never see 5000 RPM...

I have two Edel's, one on my SB and BB 600/750cfm. I think that anytime you have one you should invest in their tune up kits. Gives you different metering rods, springs, and jets to help you tune out any problems. Well worth the money ;)

graemlins/waving.gif
Rick

Its kind of ironic when someone switches not only the type, but the size of carb and then talks about the increase/decrease in performance... One of the carb choices was obviously wrong for the application...That's right... they are just air/fuel mixers, and all of them are effective designs. As long as they are tuned properly, and sized properly, all types of carbs will be very, very close in performance levels.

Glad someone here said it! smile.gif

markm - thanks for the info. i am going to try adjusting the pump shot tonight.

you guys rock!

I definately second the Q-jet. The tip in stumble is a lean condition that is caused by the carbs being made smog legal. The old AFB design (same basic carb) was noted for it's part throttle response and driveability. Try playing with the rods and going up 1 or 2 jet sizes in the front.

my edlebrock came from the factory with the pump set for the top hole. i moved it down a notch and drove it back and forth to the gym last night, about 16 miles. didn't notice any bog even though it was warm (low 80s) and fairly humid.

i think this might have fixed it. i'll keep an eye on it and watch what happens.