800 cfm AVS2 carb on 440
#2981970
11/05/21 10:17 AM
11/05/21 10:17 AM
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Joined: Feb 2003
Posts: 7,982 Scranton, PA
Montclaire
OP
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OP
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Joined: Feb 2003
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Scranton, PA
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Hello, I have an 800 cfm manual choke AVS2 carb on a 1967 440 with 915 heads, approx 9.5:1 compression, 484 mopar cam and CH4B dual plane intake. In general, I like this carb but performance has gotten inconsistent. Top end performance is great but it can feel flat at cruise. Off idle is fine (no bog at all, maybe a tad a little sluggish) but cruise smelled rich the last time I drove it. If I put my foot into it, it really wakes up. I haven't played with the air door. I am going to give it a good cleaning and check the floats but I figured I would ask what rods and jets everyone is running. It's close where it's at but I think it can be a lot better. Thanks
Last edited by Montclaire; 11/05/21 10:18 AM.
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Re: 800 cfm AVS2 carb on 440
[Re: topside]
#2982018
11/05/21 11:48 AM
11/05/21 11:48 AM
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Joined: Feb 2003
Posts: 7,982 Scranton, PA
Montclaire
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Yeah, forgot to mention gears. I have 3:91s and a 727 w/a 3000 stall converter. The kickdown was adjusted a little heavy, and when I backed it off a bit to get a better shift spread I could feel the carb bouncing in and out of the idle circuit. I changed out the step up springs to correct that, which worked but I am thinking my rods are still a little too thin. Sounds like you had to go in the same direction. I'm really digging the new boosters though!
Last edited by Montclaire; 11/05/21 11:52 AM.
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Re: 800 cfm AVS2 carb on 440
[Re: Montclaire]
#2982066
11/05/21 01:45 PM
11/05/21 01:45 PM
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Joined: Aug 2003
Posts: 43,157 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,157
Bend,OR USA
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Last edited by Cab_Burge; 11/07/21 12:32 AM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: 800 cfm AVS2 carb on 440
[Re: Cab_Burge]
#2982568
11/06/21 10:37 PM
11/06/21 10:37 PM
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Joined: Feb 2003
Posts: 2,810 Sobieski Wi
bee1971
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master
Joined: Feb 2003
Posts: 2,810
Sobieski Wi
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Stock - Metering Rod .065 X .052
I ended up with a .070 X .052 after trying the recommended .068 X .052
7" Purple Springs
13" vacuum at idle with my Comp XE275 HL Cam
383/432 Stroker
Absolutely love the carb
With your 284-484 Cam what’s your vacuum at idle ? Probably pretty low I would guess
Last edited by bee1971; 11/06/21 10:44 PM.
1971 Dodge Charger Superbee 2011 Ram Sport 1500 Quad Cab Deep Water Blue Loaded Siberian Huskies
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Re: 800 cfm AVS2 carb on 440
[Re: bee1971]
#2982594
11/07/21 12:38 AM
11/07/21 12:38 AM
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Joined: Aug 2003
Posts: 43,157 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,157
Bend,OR USA
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Stock - Metering Rod .065 X .052
I ended up with a .070 X .052 after trying the recommended .068 X .052
7" Purple Springs
13" vacuum at idle with my Comp XE275 HL Cam
383/432 Stroker
Absolutely love the carb
With your 284-484 Cam what’s your vacuum at idle ? Probably pretty low I would guess I would never buy and use another Mopar 284 Hydraulic cam after trying one once back in the late 1990, THEY ARE JUNK The cam I used in the motor I'm talking about (400 block stroke to 4.300 with a 4.375 bore with 9.25 to 1 compression originally) was a custom Comp Cams solid roller that had 260@.050 on the intake side with .420 lobe lift and it had 266 @.050 on the exhaust side with .409 lobe lift, I bought and used a set of Harland Sharp 1.65 ratio rockers. That motor was a absolute pleasure to drive and race with, 700+ HP at 5500 RPM using Oregon 91 octane pump swill
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: 800 cfm AVS2 carb on 440
[Re: bee1971]
#2982599
11/07/21 01:04 AM
11/07/21 01:04 AM
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Joined: Feb 2003
Posts: 7,982 Scranton, PA
Montclaire
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OP
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Joined: Feb 2003
Posts: 7,982
Scranton, PA
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With your 284-484 Cam what’s your vacuum at idle ? Probably pretty low I would guess
Vac was around 8 or 9 at idle.
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Re: 800 cfm AVS2 carb on 440
[Re: Montclaire]
#2982694
11/07/21 11:53 AM
11/07/21 11:53 AM
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Joined: Feb 2003
Posts: 2,810 Sobieski Wi
bee1971
master
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master
Joined: Feb 2003
Posts: 2,810
Sobieski Wi
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With your 284-484 Cam what’s your vacuum at idle ? Probably pretty low I would guess
Vac was around 8 or 9 at idle. Surprised it’s that high honestly Anyways so stick with the 5" factory orange springs or drop down to the yellow 4" Start with the .068 X .052 metering rods , verify your float level and drop and go from there What’s your plugs look like in idle/cruise circuit Have you pulled them
1971 Dodge Charger Superbee 2011 Ram Sport 1500 Quad Cab Deep Water Blue Loaded Siberian Huskies
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