I've got an Edel Thunder 800 on my 383 and my buddy just built a Pontiac 461 stroker and eng builder didn't even want to look at his carb which is the same model.They made 1 run then switched to Holley,then Demon made most power w/Demon but never did any tuning on Edel.there was a 60 hp diff between Edel 800 vs Holley 750dp Are the Edel that bad or is it preference ?:confused:

I've got an Edel Thunder 800 on my 383 and my buddy just built a Pontiac 461 stroker and eng builder didn't even want to look at his carb which is the same model.They made 1 run then switched to Holley,then Demon made most power w/Demon but never did any tuning on Edel.there was a 60 hp diff between Edel 800 vs Holley 750dp Are the Edel that bad or is it preference ?:confused:
I think with that much difference the Edel was not tuned or even something wrong with the carb.

I ran a Performer 650 on an El Camino I used to have. It was jetted rich out of the box but after playing with the metering rods it ran great. Try the Edlebrock.

not much luck with Edy,put my buddys 750 Demon and ran great ?

I NEVER had any issues with my Edelbrock. EVERYONE has their own preferences. It sounds like the guy just didn't want to or didn't know how to tune an Edelbrock. I still have my Thunder 650. I only changed it to go to a Q-Jet. Better mpg, power and overall driveability.

That carb may be a bit to big for your application. We run the Edelbrock #1806 650cfm carb on our 383's up near around 430-460hp and it runs perfect out of the box. From what we see Edelbrock out of the box always beats the Holley, but you can fine tune and jet the holley to be better. The Holley 750dp is a much better carb than the 800 edel as well. I better comparison to it would be the Holley Street Avenger 770cfm.

The Edelbrock design is just a slightly reworked Carter Carb of old :thumbsup:
There is absolutely nothing wrong with them, but they are a bit harder to work on and set-up than a Holley or other non-Varible Jet type carb.

To set the proper fuel metering for these style carbs you need to match/mix-&-match the fixed Jet(s) and the Movable metering Rod(s).
The use of these movable rods gives the carb and excellent fuel metering system with lots of built in adjustablity and thus they make a good carb for varying driving conditions - but they can be a real PITA to get them there ... You need to sellect a specific rod(s) and jet(s) set-up to meet you driving condition(s) and often this is a compromise between the best metering to give you streetablility vs. all out power.
These carb.s are also very sensitive to fuel level in the bowls. This makes setting the floats and having a dependable fuel delivery system a must with them.
They don't need (or like) a lot of pressure, but they do need a good flowing system to keep the bowls full for consistant metering. So go for GPM vs. PSI when designing you system.
I find a well designed system using a good flowing electrical pump, like the 6~7psi Carter centrifical type, and proper line sizing really makes a difference in their performance.
If you starve one of these carbs it will never perform correctly :noway:

I know several folks that just swear by these carb.s and they are true 'motor-heads' that don't mind working on their cars and getting their set-ups just right.
I conversely know several who won't go near them and swear Holleys ( and even Rochesters :D ) are a "better" carb ...
I all depends on your experieince, needs and dedication to working with a given unit and set-up :yes:

Edelbrock just isnt a performance carb, now a reliable carb yes, belongs on stock type rebuilds when you can't or don want to use a q-jet or AFB.

Guys, there is a reason 99% of dragsters run a holley based carb, if edelbrocks out shined holley and were more easy to tune, they would run them.

ANYBODY out there running one of these and if so what's your set-up ? Edelbrock says they run them on their crate motors and work fine ? On my 383 the A/F ratio guage is all over the map(rich-lean) tried several jet/needle swaps w/no luck.Fuel system is Holley elec.1/2" ss feed from sump and 3/8" ss return:sad:

ANYBODY out there running one of these and if so what's your set-up ? Edelbrock says they run them on their crate motors and work fine ? On my 383 the A/F ratio guage is all over the map(rich-lean) tried several jet/needle swaps w/no luck.Fuel system is Holley elec.1/2" ss feed from sump and 3/8" ss return:sad:
It wouldn't make sense to run any other name carb on THEIR motors, though a holley based carb would out perform it, they don't want others getting that idea.
Their carbs are just like their heads, very well quality madem everything checks out, but you pay for the quality, not the performance.

I run a Quick Fuel Q750 on a Dyno's 503 HP 383 Stroker with a 1" Plate. Performs to beat hell.

I agree...edelbrocks are much more reliable, easy to adjust...performance is a No. Holley and Quick Fuel are the 2 that all the racers here use. Quick fuel if you do not know use a Holley body.

Edel carb is good for street and MPG... Holley/Demon for performance.
There's a post over on Team Chevelle where he swapped a Edel for a Holley and went .5 faster.
I took a running 350 out of my Camaro to install my 400 and swapped out the intake/carb assembly from the 350 to the 400 and couldn't get it to run for shi..squat. Pulled the carb and tossed it, installed my Holley and the rest is history.

Let's see, E-brock has or did have.......

The AFB;

The AVS;

The Q-Jet;

So which one are we talking about here?

pdq67

PS., and the electric Q-Jet is the most sophistocated(Sp?) carb there is short of EFI, imho.

I've got an Edel Thunder 800 on my 383 and my buddy just built a Pontiac 461 stroker and eng builder didn't even want to look at his carb which is the same model.They made 1 run then switched to Holley,then Demon made most power w/Demon but never did any tuning on Edel.there was a 60 hp diff between Edel 800 vs Holley 750dp Are the Edel that bad or is it preference ?:confused:

Let's see, E-brock has or did have.......

The AFB;

The AVS;

The Q-Jet;

So which one are we talking about here?

pdq67

PS., and the electric Q-Jet is the most sophistocated(Sp?) carb there is short of EFI, imho.

Thunder series AVS

Let's see, E-brock has or did have.......

The AFB;

The AVS;

The Q-Jet;

So which one are we talking about here?

pdq67

...


They don't do Rochester Q-Jets anymore :noway:
They got out of that series a few years back and are trying to back-out of the replacement parts for them now also - so, if you need anything better get it now ;)
Good news is most of what you'd need is readily available over the counter at most good parts houses or mail-order.

Thanks John.

I figure ol' Vic tried to corner the carb market and paid too much, then tried to re-coupe his investment too fast on the Q-Jets and took a bath! And it's a real shame too!

pdq67

Like anything else everyone has their own personal preference in carbs. I agree to a certain point that Holley carbs are probably better on the drag strip and Edel. and Carter AFB's are more street friendly. I have run both holley and edel. carbs with good success but I am more comfortable working on the AFB carbs. I run dual Edel. 600 carbs on my GTO with a 462" Pontiac motor and a 600 on my 460 Ranchero. Once you get them dialed in right they work fine in most street applications.

Its a preference really but I agree with ace's.

Edelbrock is really a more street mannered stock replacement type. Harder to make adjustments right when you are constanlty tweaking your performance machine.

I would 100% recommond demon. They are hands down superior to edelbrock and holley. The holley's are nice and easy to use and so are the demons use the same concept but I will never run anything but demon now after doing a swap from a holley 750 to a demon 750.

The demon has much better entrances rounded instead of blocked and my throttle response is unbelievable. I barely touch the gas and before I can pull my foot back its at 6 grand compared to being able to almost floor it on my edelbrock or holley before it gets revving that high. I have never had luck with edelbrocks.

You will see power differences though not all carbs flow the same as for your A/F being everywhere that would have been the point i threw the carb in the trash.

I run a 750 edel on my 400 small block and it took alot of messing around on the dyno to get it tuned right, that being said once it was tuned there were no real differences on the dyno compared to the 750 barry grant that we tried on it. I still have the 750 barry grant but have never bothered to install it on the car as I am happy with the edelbrock, and dont race the car other than the odd test and tune night so the need to constantly mess with the carb is not there. I just get in it and go. I do think an 800 for a 383 is a little too much carb and am contemplating trying something smaller on my own.

An 800 is not to large for a 383 it depends on the motor. I had to jet my 750 up considerably a 950 is in the near future.