Edelbrock AVS 2 650 CFM

[LB1951]

Anyone running the 650 AVS 2 on a big block? Just wondering how the performance is. I put one on a 68 Dart GTS 340 car and the difference between the AVS2 and the Holley was like night and day, no comparison the Eddy out performs the Holley hands down. The throttle response is incredible.

 

[Chryco Psycho]

Why would you use a carb that small on any big block ?

 

[LB1951]

Why would you over carb a near stock big block when from the factory they came with 650 Carter AVS's. Over carb is worst thing you can do.

 

[fasjac]

In 1971 I think the 850 thermo-quad was a factory carb on some 340ci engines. Definitely not trying to start anything but, read it from old manuals a few weeks ago. Just ran across when I found a couple of those carbs in the barn. That carb was a different animal all together though.

 

[djais1801]

I am using AVS2 800 on my 440 4spd w an aggressive cam

 

[Steve340]

I have the standard Carter AVS on my GTX. The engine is completely stock and on the dyno made maximium power at 4000 rpm.
My thoughts are if the car is fairly mild or stock (you did not say)I would run the 650.

 

[LB1951]

According to Edelbrock the 650 AVS 2 is for small blocks and big blocks up to 400hp. Anything over 400 hp they recommend the 800 AVS 2

 

[Steve340]

I would go along with the Edelbrock info you posted. A small carb on a mild build, conservatively driven makes sense.
My 440 only cranked out 300 HP on the dyno, 420 ft/lbs of torque so it does not hold up traffic.
It is also very good on gas which is great as it is pricey here.

 

[djais1801]

my 440 dyno'd at 403 hp and 451 tq.

 

[LB1951]

Rear wheel HP ? If it is you should be using a AVS 2 800 cfm carb. Mine dyno'd 305 at the rear wheels, just a real mild build no headers stock exhaust manifolds. 2 1/2 in TTI all the way back, Edelbrock Performer RPM intake, Performer 750 carb and a really nice hydraulic adjustable lifter cam. 4 speed with 3:54 dana. Max HP and torque at 5600 rpm

 

[domeboys]

I have a bone stock 383 in my '70 Challenger that was 2-BBL, single-exhaust. With a simple move to dual exhaust and an Edelbrock 650 CFM carb, I am delighted with the improvement in performance, but did not take before/after measurements. (For completeness, I also had to change the intake manifold, air cleaner and the passenger side exhaust manifold. Stock part number manifold replacements were not too hard to find.)

 

[djais1801]

Rear wheel HP ? If it is you should be using a AVS 2 800 cfm carb. Mine dyno'd 305 at the rear wheels, just a real mild build no headers stock exhaust manifolds. 2 1/2 in TTI all the way back, Edelbrock Performer RPM intake, Performer 750 carb and a really nice hydraulic adjustable lifter cam. 4 speed with 3:54 dana. Max HP and torque at 5600 rpm

my dyno sheet said max power 403/451. my car has a torker ii intake, 2" headers, 3" exhaust, a

my dyno sheet said max power 403/451. my car has a torker ii intake, 2" headers, 3" exhaust, and an aggressive hughes cam

 

[Glenn's HC]

my 440 dyno'd at 403 hp and 451 tq.

I love the stance of your challenger , are you using
"Super stock" Springs ?

 

[Glenn's HC]

I just ordered the 800CFM AVS2 for my stock 70 Challenger 440 with stick and 354 Dana , will post results after I run it and let you know what kind of gains or issues over the stock carter

 

[djais1801]

I love the stance of your challenger , are you using
"Super stock" Springs ?

thanks...no but that's next on the list. it has air shocks right now...came with the car

 

[toolmanmike]

Remember, the AVS carbs have a adjustable spring tension secondary air door that opens as needed. Kind of like Thermoquad's and Quadrajet's. The vacuum secondary Holley's use a vacuum diaphragm to open the secondaries.

 

[LB1951]

The AVS-2 650 CFM I put on my 340 Dart GTS worked perfect right out of the box. I didn't need to adjust the air door. I set the idle and the air / fuel screws and that was it.

 

[MoparJason]

I am using AVS2 800 on my 440 4spd w an aggressive cam

First of all I love your challenger and the choppy idle and it's good to see that so many people are opting for carter/edelbrock carbs for their rides instead of holley's. I plan to buy and run a 650 AVS2 carb on my small block that is going into a Cuda in the near future.

 

[john_wick]

I'm looking at getting an avs2 for my new build. I have a 383 but I'm not sure what's in it. I was going to get a 650 but after reading this thread maybe the 800? And sorry for the newb question but which choke version would be easier: manual or electric? TIA.

 

[Chryco Psycho]

IMO I would use a 750 Proform or 3310 Holley , Far better carb than eddy , Most of these cars are only driven in warmer weather so I would use a manual choke if you bother to use it at all , typically you can start the engine easily & feather the throttle for a minute or so & they will run fine without using a choke .