Edelbrock Thunder AVS series

[JoeHall]

My definition of 'massive improvement' on using non-stock carbs or EFI on Studes, is all about hot weather performance. Nothing we can put on a Stude V8 will provide massive power improvement; the biggest power improvement is when going from 2B to 4B, but that's only in upper RPM. My favorite carb on 259/289 is the model 4350, 'baby Holley' which flows 450cfm. With a manual choke, phenolic spacer and fuel return line, it's about as good as it gets for hot restarts in hot weather. The absolute worse for hot restarts is a stock 2B, or WCFB.

On the 56J's 352, best all around carb was an AFB, but it cranked a bit for hot restarts. It added a bit more power when the 4Bs kicked in, but only at upper RPM. I also tried an AVS on it when I lived in the desert, hoping to improve something, but it was about same as AFB in all measures: hot restart, MPG, and power. I did not like it so took it off and put the AFB back on. I also tried a 450 CFM baby Holley on the 352, but it wheezed a bit at mid to upper RPM. I recently tried a Demon, with phenolic bowl, and it was the best at hot restarts, but MPG was terrible, and it needed dialing in. I did not bother to dial it in, just took it off. I am currently running a stock WCFB, that was NOS when I installed it a couple of years ago. It performs exactly like a good WCFB, and is the absolute worst in any measure on the 352, but I am just gonna leave it alone, at least for now.

[tsenecal]

I run the street demon with phenolic bowl on my 299" Hawk. I changed jets and metering rods until it runs beautiful now. I can reach through the window, turn the key, and it is running instantly. My fuel injected cars all crank longer before they start.

[1960Hawk]

ok, I have bought a cheap 1902 AVS2.
I have a dilemma....
should I grind my 4 barrel intake to accommodate the larger rear butterflies....
or modify a 2 barrel intake with the larger looking plenum? (i have both)
either way I will be adding1/2" phenolic spacer

[1960Hawk]

The 2 barrel mod to 4 barrel have have a divided plenum...or is it fully open ?

[1960Hawk]

hello again...
I will be making a phenolic tapered adapter plate and gasket.
could someone please who has a standard 4 barrel gasket lying around be able to scan it and send to me in PNG format?
also the measurement across both sides sq would be help full to confirm exact size
I need to know the square bore holes so I can get the taper right
thank you...

[JoeHall]

hello again...
I will be making a phenolic tapered adapter plate and gasket.
could someone please who has a standard 4 barrel gasket lying around be able to scan it and send to me in PNG format?
also the measurement across both sides sq would be help full to confirm exact size
I need to know the square bore holes so I can get the taper right
thank you...

Just use a manifold gasket as a template. Much easier, and less likely to goof up.

[1960Hawk]

Just use a manifold gasket as a template. Much easier, and less likely to goof up.

Yeah that's what I'm after....
going to make a spacer taper from an AVS2 to a standard sq bore intake manifold....

Edit: all good, just bought an original gasket 👍

[Dan Timberlake]

Back in the 1970s AMC published SAE 720214 about intake and exhaust manifold improvements .
A few comments about flow versus improved fuel atomization in the region of the intake manifold carb throttle bores attracted my attention, and still do.

[1960Hawk]

wow time flies......
ok so I made up a couple stainless plates (0.5mm) to cover the exhaust crossover on the intake manifold.
going to use paper gaskets to keep thickness down.
I will do it to both sides of the intake manifold and block exhaust crossover completely...correct ?

anyone see any problems doing it this way?

[StudeRich]

All you really needed was a small plate to block the Right Heat Port to put under the Gasket to prevent overheating your Carb. while totally disabling the Automatic Choke Heat System.

But if you use an Edelbrock Electric Choke or Manual Choke you should be OK.

Also there is No need to Block the Left Side at all, there will be No flow there.

The Thick Gaskets and Thin Blocking Plate are available I believe, at Myer Studebaker in Ohio.

[1960Hawk]

cheers,

live and learn

[DEEPNHOCK]

Before y'all go slot crazy...
Look real hard at the bottom of the carb base plate......

[1960Hawk]

Before y'all go slot crazy...
Look real hard at the bottom of the carb base plate......

for us novice mechanics, can you elaborate please Jeff

[DEEPNHOCK]

Originally posted by DEEPNHOCK
Before y'all go slot crazy...
Look real hard at the bottom of the carb base plate......

for us novice mechanics, can you elaborate please Jeff

If you look at the bottom of the base plate on the carb.
There are slots already in place from Edelbrock.
Jeff

[1960Hawk]

ok, so carby finally installed

b4 I start tuning, a question about metering rod springs.
stude delco window distributor vacuum advance is 0 degrees of advance until 6" of vacuum, and 16 degrees of advance at 12" of vacuum.
so which springs am i supposed to be using as a starting point?
3" Hg (blue) for 6"
or 5" Hg (orange), 7" Hg (pink) Springs for 12"

[1960Hawk]

5" Hg (orange) starting point

[Hawklover]

hi...I want to replace my old and tired Holley 600cfm with an Edelbrock 500cfm on my 289
Is anyone using these latest series carbs or know about them....
I was looking at this one Edelbrock Thunder 1904 Carburetor, AVS 2, 500 cfm, 4-Barrel.
This one has the adjustable spring secondary air valves.
Or go with the old school type non adjustable weighted secondary air valves?
was going for the manual choke too...

also is it ok to grind out the holes on the intake manifold to an open square?
any thoughts welcome

I have one on my '64 Avanti.............could not be happier!!