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650 or 800 AVS2 #2843151
11/07/20 06:32 PM
11/07/20 06:32 PM
Joined: Feb 2003
Posts: 3,660
MO
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cdp Offline OP
master
cdp  Offline OP
master
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Joined: Feb 2003
Posts: 3,660
MO
I have a fresh stock rebuild 71 440 HP in my GTX (mr. SixPack cam, & electronic distributor are only 2 changes). Automatic, 323 sure grip,

Changing out the original AVS for a new AVS2. Which is the best choice?

650 or 800cfm? I'll be going with an electric choke version.

Thanks
Chris

Re: 650 or 800 AVS2 [Re: cdp] #2843164
11/07/20 06:57 PM
11/07/20 06:57 PM
Joined: Jan 2003
Posts: 28,793
Oregon
A
AndyF Offline
Too Many Posts
AndyF  Offline
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Joined: Jan 2003
Posts: 28,793
Oregon
I put the smaller one on there.

Re: 650 or 800 AVS2 [Re: cdp] #2843205
11/07/20 08:06 PM
11/07/20 08:06 PM
Joined: Jan 2003
Posts: 6,942
Benton, IL.
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DaveRS23 Offline
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DaveRS23  Offline
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Joined: Jan 2003
Posts: 6,942
Benton, IL.
Have you looked at the Street Demon carbs? They have some real advantages over the decrepit CarterBrocks. Plenty of tests and reviews on the 'tube. Here are just a couple;


www.youtube.com/watch?v=DPOuEOkazVc&t=275s
https://www.youtube.com/watch?v=YNAlVFtUFL4


KOS
Re: 650 or 800 AVS2 [Re: DaveRS23] #2843247
11/07/20 09:33 PM
11/07/20 09:33 PM
Joined: Sep 2005
Posts: 176
Norfolk County , Ontario
WORKER_BEE Offline
member
WORKER_BEE  Offline
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Joined: Sep 2005
Posts: 176
Norfolk County , Ontario
A year ago I bought an 650 Eddy AVS2 to put on my 440 in my Crown Coupe. Before I did that I tried it on my stock 440 Magnum in my Charger to see how it would work on it. What I noticed was that the idle was more smoother and basically drove nicer threw out the rpm scale. I also thought that it felt like it was a little down on power at full throttle compared to the factory Carter AVS. I want to emphasize...just a little.
Personally I would go with the 800 AVS2.


1969 Super Bee Six Pack
1969 Charger R/T SE
1968 Crown Coupe
Re: 650 or 800 AVS2 [Re: WORKER_BEE] #2843383
11/08/20 10:05 AM
11/08/20 10:05 AM
Joined: Mar 2018
Posts: 69
NW Indiana
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powertrip Offline
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Joined: Mar 2018
Posts: 69
NW Indiana
Originally Posted by WORKER_BEE
A year ago I bought an 650 Eddy AVS2 to put on my 440 in my Crown Coupe. Before I did that I tried it on my stock 440 Magnum in my Charger to see how it would work on it. What I noticed was that the idle was more smoother and basically drove nicer threw out the rpm scale. I also thought that it felt like it was a little down on power at full throttle compared to the factory Carter AVS. I want to emphasize...just a little.
Personally I would go with the 800 AVS2.


The reason those new AVS2 carbs are so responsive is that the primarys are choked for flow with those HUGE annular boosters stuffed in there.
I bought a pair of the 800's to use on a crossram, I tried them on the flow bench and they only flowed around 700 cfm!! They were sent back and standard booster 800's were used.

Re: 650 or 800 AVS2 [Re: powertrip] #2843534
11/08/20 04:07 PM
11/08/20 04:07 PM
Joined: Jan 2011
Posts: 456
florida dade
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cesar perez Offline
mopar
cesar perez  Offline
mopar
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Joined: Jan 2011
Posts: 456
florida dade
Why the standard boosters flow more

Re: 650 or 800 AVS2 [Re: cdp] #2843659
11/08/20 09:14 PM
11/08/20 09:14 PM
Joined: Aug 2003
Posts: 37,739
Bend,OR USA
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Cab_Burge Offline
I Win
Cab_Burge  Offline
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Joined: Aug 2003
Posts: 37,739
Bend,OR USA
I would put a 750 or 780 vacuum secondary Holley carb on it twocents scope


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: 650 or 800 AVS2 [Re: Cab_Burge] #2843714
11/08/20 11:22 PM
11/08/20 11:22 PM
Joined: May 2008
Posts: 160
Las Vegas, NV
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chargerbr549 Offline
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chargerbr549  Offline
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Joined: May 2008
Posts: 160
Las Vegas, NV
I run the 800 Thunder series AVS carbs on a couple of my big blocks and really like them, they are very responsive.

Re: 650 or 800 AVS2 [Re: chargerbr549] #2843854
11/09/20 09:41 AM
11/09/20 09:41 AM
Joined: Jan 2003
Posts: 12,372
Marion, South Carolina [><]
an8sec70cuda Offline
I Live Here
an8sec70cuda  Offline
I Live Here

Joined: Jan 2003
Posts: 12,372
Marion, South Carolina [><]
750 minimum


CHIP
'70 hemicuda...8 sec street car
'69 road runner 440 w/ Indy SRs
'69 road runner 440-6, 4 speed...Dad's ride
'71 Demon 340 resto project
'06 GMC 2500HD LBZ Duramax...toy hauler
'16 Grand Caravan SXT...baby hauler






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