I have a 572 Hemi that I am building, and have the Indy Dual-Quad (dual top) intake, and I need some help selecting the best Edelbrock Carbs for it. Street/Strip car.

The choices are the Edelbrock Thunder 800cfm AVS or the 750cfm standard carbs, and I will also be setting them up with a progressive linkage, since it will be a street strip car. It will only see the strip maybe twice a year, and be street driven.

The car is a '69 GTX, 11.75CR, Hyd/roller Cam, 4.10 gears, 5spd Manual, 3650lbs, Caltracs, etc...

I want the car streetable, but also great for the strip, and I have seen AndyF recommend the Edelbrocks.

Thank you for the advice, Mark

I've run both 750/800 AFB on my 572 wedge, no difference in ET. In fact 750 AFB's are less then .10 difference in ET between Pro-Systems Holley's,(9.02/9.11). My AFB's idle perfect with a 285@.050" roller cam. Also drivability in the pits is excellent. That being said the AVS air doors are adjustable which is a nice feature. AFB's are available used cheap everywhere. If I was buying new I'd get the AVS.
Doug

Thanks DVM,

I am buying new and do not want to buy twice...done that too many times.

Since the Thunder AVS's are fairly new, I just wanted to know if anyone has had problems with them in a dual quad configuration.

Thanks!

AVS: OEM in 1968.

for street and strip i'd do the 750's. i'm driving around on a pair of 600's with an edelbrock ch28 and they're none too big.

Guess your not familiar with how much air & fuel a 572 Hemi requires....I would run the 800 Thunder series. I had a pair of 750 eddy carbs on my 472 at one time, and they were always lean. Great idle and so on, but scary lean down the track with the biggest jets I could find.

i believe the hemi will handle 800's, but my thoughts were STREET and strip. my experience with edelbrock jetting is the opposite of yours.

Why strap yourself with the Edelbrock?

If you spend the money a Holley will make more HP and not have hassle factor.

I know that won't go over well around here but facts are facts.

Like stated, the modified Holley's were no faster back to back, same weather. Also the size of the carbs has absolutely nothing to do with being to rich or lean. If a carb won't go richer with larger jets there is a restriction in the fuel feed somewhere. I've never had to run my Edelbrock's more than 2 stages rich. Most of the time stock jetting or 1 step rich is plenty. Runs 148+ mph @ 3340lbs like clockwork.
Doug

Thanks all,

My main concern was the "drive-ability" of Holleys, since I have had them on a couple of track cars (dual Quad) before, and the idle was always on the rich side. AndyF mentioned that the Edelbrocks had great idle and low-end manners for the street.

I do know the Holley's would be best for the strip, but I will be driving the car on the street some, and only going to the track 2-3 times a year max.

If the Thunder 800cfm AVS carbs are the way to go, then that is what I will buy. Also, at some point, I may end up with a cross-ram intake, and the Eddy's would work great on that too, I assume?

Thanks, Mark

I had 500 Thunder Series on my 408 T-Ram and loved them.....I would not hesitate to run the 800 series on your build .02

Rickster

'If you spend the money a Holley will make more HP and not have hassle factor.'






LMAO...

Doug...

It just never ends, does it???


Go get 'em...