Re: 440 suggested carb
[Re: MILFORD MOPARS]
#3200073
12/26/23 12:44 PM
12/26/23 12:44 PM
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Joined: Nov 2006
Posts: 4,761 Star Idaho
67vertman
master
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master
Joined: Nov 2006
Posts: 4,761
Star Idaho
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have a 440 mild cam with a little porting auto trans . not a numbers car.. i like Holeys what carb would you all recommend? i was thinking 750 vacuum secondary thanks for any input Oh boy, here comes the You know it is winter Moparts season? I like the I like the Holley 3310 750cfm
My Monster are real!
Living within your means makes life pretty easy.
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Re: 440 suggested carb
[Re: MILFORD MOPARS]
#3200127
12/26/23 05:48 PM
12/26/23 05:48 PM
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Joined: Jun 2014
Posts: 3,192 Md.
carnut68
master
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master
Joined: Jun 2014
Posts: 3,192
Md.
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Quick Fuel Brawler BR-67258 770 VC. Completely adjustable air bleeds ect. Adjustable vacuum secondary, electric choke. I have one and it works great.
America First!
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Re: 440 suggested carb
[Re: MILFORD MOPARS]
#3200150
12/26/23 08:13 PM
12/26/23 08:13 PM
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Joined: Jan 2003
Posts: 12,108 Benton, IL.
DaveRS23
Special needs idiot
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Special needs idiot
Joined: Jan 2003
Posts: 12,108
Benton, IL.
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Why doesn't anyone ask the OP's level of willingness and ability to 'tune' their new carb BEFORE making a recommendation? A carb that is 'easy' to tune (and needs to be tuned) may not be for them. And most guys are probably wanting a 'bolt on and go' type of deal. The 3310 is a good universal carb. I have installed quite a few over the years. BUT! They are WAY rich on the cruise. 4 to 6 steps on the mains on most and then, the PVCRs need drilled larger to get the WOT back where it needs to be. And the secondary will need a quicker spring on most every engine I have ever put one on. There are a couple of other things that usually need attention, too. So again, if the OP is comfortable with 'tuning', then the 3310 may be a good choice. But let's be clear; it is putting far too much fuel into the engine at light loads. And for a street car, the Double Pumpers are even richer. Holley lists them a 'track carb' after all. And for good reason. If the OP wants a Holley platform carb, I would suggest calling Holley with the details and getting a recommendation from them. They have a lot of carbs with different tunes for different applications. Starting with a carb that is closer to the real needs of the combo is always better than starting father away. Personally, I would suggest avoiding the AFB/AVS CarterBrocks simply because their 'tunes' are ancient. And if the OP does want to tinker with the idle and off idle tuning, they are a royal PITA. The basic platform is a good one. It's just a shame that after all these years and with all the different companies making a version of them that no one has updated the transitions or made them easier to adjust. But it is what it is. My go-to carbs the last few years have been the Street Demons. They have the very best off idle transitions going today. Plenty of youtube videos on them. BUT! They are a street carb and are for stock and nearly stock engines. The rougher the idle, the less they make sense. If the idle is rough, it may be difficult for the OP to get an out-of-the-box carb to get the job done without needing to be tuned or being excessively rich.
Master, again and still
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Re: 440 suggested carb
[Re: DaveRS23]
#3200174
12/26/23 10:42 PM
12/26/23 10:42 PM
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Joined: Jan 2003
Posts: 27,468 So Cal
autoxcuda
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,468
So Cal
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Why doesn't anyone ask the OP's level of willingness and ability to 'tune' their new carb BEFORE making a recommendation? A carb that is 'easy' to tune (and needs to be tuned) may not be for them. And most guys are probably wanting a 'bolt on and go' type of deal. The 3310 is a good universal carb. I have installed quite a few over the years. BUT! They are WAY rich on the cruise. 4 to 6 steps on the mains on most and then, the PVCRs need drilled larger to get the WOT back where it needs to be. And the secondary will need a quicker spring on most every engine I have ever put one on. There are a couple of other things that usually need attention, too. So again, if the OP is comfortable with 'tuning', then the 3310 may be a good choice. But let's be clear; it is putting far too much fuel into the engine at light loads. And for a street car, the Double Pumpers are even richer. Holley lists them a 'track carb' after all. And for good reason. If the OP wants a Holley platform carb, I would suggest calling Holley with the details and getting a recommendation from them. They have a lot of carbs with different tunes for different applications. Starting with a carb that is closer to the real needs of the combo is always better than starting father away. Personally, I would suggest avoiding the AFB/AVS CarterBrocks simply because their 'tunes' are ancient. And if the OP does want to tinker with the idle and off idle tuning, they are a royal PITA. The basic platform is a good one. It's just a shame that after all these years and with all the different companies making a version of them that no one has updated the transitions or made them easier to adjust. But it is what it is. My go-to carbs the last few years have been the Street Demons. They have the very best off idle transitions going today. Plenty of youtube videos on them. BUT! They are a street carb and are for stock and nearly stock engines. The rougher the idle, the less they make sense. If the idle is rough, it may be difficult for the OP to get an out-of-the-box carb to get the job done without needing to be tuned or being excessively rich. I agree. The level the OP wants to keep the tune is significant to the recomendation. But we need more info, IMHO. What are the cam specs? What intake manifold do you have? Cast Iron exhaust or headers? What is the rear end gear ratio and rear tire size?
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Re: 440 suggested carb
[Re: AndyF]
#3200624
12/29/23 10:52 AM
12/29/23 10:52 AM
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Joined: Aug 2006
Posts: 2,512 God's Country Maryland
GODSCOUNTRY340
master
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master
Joined: Aug 2006
Posts: 2,512
God's Country Maryland
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Engine like that doesn't need more than 600 cfm but a 750 vac secondary won't hurt anything. The 750 will probably never fully open since that engine will only use 500 to 500 cfm of air at WOT. Really, 500 cfm? Wonder why the six pack worked so well on the 440, 1350 cfm. They also worked on the 340 engine.
I love the smell of Deer guts in the morning, it smells like... VICTORY!
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Re: 440 suggested carb
[Re: GODSCOUNTRY340]
#3200651
12/29/23 12:17 PM
12/29/23 12:17 PM
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Joined: Jan 2003
Posts: 31,042 Oregon
AndyF
I Win
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I Win
Joined: Jan 2003
Posts: 31,042
Oregon
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Engine like that doesn't need more than 600 cfm but a 750 vac secondary won't hurt anything. The 750 will probably never fully open since that engine will only use 500 to 500 cfm of air at WOT. Really, 500 cfm? Wonder why the six pack worked so well on the 440, 1350 cfm. They also worked on the 340 engine. Six pack doesn't flow 1350 cfm, that is a 2bbl rating number not a 4bbl rating number. Engine output of 400 hp requires 569 cfm with a BSFC of 0.500. If the engine is more efficient than 0.500 then it requires even less air to make 400 hp.
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Re: 440 suggested carb
[Re: AndyF]
#3200698
12/29/23 02:24 PM
12/29/23 02:24 PM
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Joined: Sep 2003
Posts: 19,421 north of coder
moparx
"Butt Crack Bob"
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"Butt Crack Bob"
Joined: Sep 2003
Posts: 19,421
north of coder
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i am unlike all here, in that i love Thermo-Quads ! however, it took me YEARS to figure them out, and be able to tune them to my needs. the result is good/reasonable gas mileage with the added oomph of the monster secondaries tunable with the air door. before my retirement, jets and metering rods were kind of hard to find, so i whipped up programs for them on a CNC we had at work, then made a bunch of each. in the interim, i pick up T-quads cheap at swaps, or sometimes i get them for free from friends. the only real problem i run into almost always, is the jet wells on the bottom of the float bowl come loose and leak. the fix for that is the gasoline resistant version of JB weld. no problems otherwise.
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Re: 440 suggested carb
[Re: AndyF]
#3200712
12/29/23 03:01 PM
12/29/23 03:01 PM
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Joined: Jan 2003
Posts: 12,108 Benton, IL.
DaveRS23
Special needs idiot
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Special needs idiot
Joined: Jan 2003
Posts: 12,108
Benton, IL.
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I had thought that many of us had run this test over the years. We frequently threw larger carbs on our Mopars. And with varying degrees of success due to a number of factors besides just the size of the carb. But I firmly believe that most 440s would be quicker at the drag strip with carbs larger than 600cfm. Now, for street only we can talk about the smaller being better until you throw in the spreadbores like the Thermoquad. But overall, don't most here feel that any credible 440 with a tuned 750 would outrun one with a 500 or 600cfm carb? Aren't there any youtube videos doing this kind of shootout? Or has everyone thought that this was settled (rightly or wrongly) in the 1970s? Engine Masters episode 44 tested a mild 383 shivvy with a 600 and with a 750 carb. But I am not a subscriber. Can anyone link that test? Here's Uncle Tony's take on this: www.youtube.com/watch?v=HdF7IAWFT8wAnd he does make some good points on this subject.
Master, again and still
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Re: 440 suggested carb
[Re: A12]
#3200779
12/29/23 08:56 PM
12/29/23 08:56 PM
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Joined: Jun 2014
Posts: 3,192 Md.
carnut68
master
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master
Joined: Jun 2014
Posts: 3,192
Md.
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Simple plug and play Holley 770 Street Avenger You can't change the air bleeds easily. Check out the Brawler carb I posted BR-67258.
America First!
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Re: 440 suggested carb
[Re: carnut68]
#3200795
12/29/23 10:18 PM
12/29/23 10:18 PM
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Joined: Jan 2003
Posts: 21,514 N.E. OHIO, USA
A12
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 21,514
N.E. OHIO, USA
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Simple plug and play Holley 770 Street Avenger You can't change the air bleeds easily. Check out the Brawler carb I posted BR-67258. Never found changing the air bleeds "easily" an issue? Had the Street Avenger's as mentioned plug and play on both of my 383 '68 RR and 440 4-speed '69 GTX and no need for an easy air bleed change. All of the easy adjustments on the Holley SA were more fun to play with but not really necessary just did them as mention to play around with. Both the 383 and 440 SA's were plug and play and spot on out of the box. Just saying if the OP wants to drive the car without making adjustments.
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Re: 440 suggested carb
[Re: DaveRS23]
#3200797
12/29/23 10:19 PM
12/29/23 10:19 PM
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Joined: Jan 2003
Posts: 5,444 So Cal
Sinitro
master
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master
Joined: Jan 2003
Posts: 5,444
So Cal
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Basically there is no perfectly tuned carburator out-of-the-box. Yes, there is a slight chance it may work well upon install but not likely.. Today many new carburators are tuned on the lean side for emissions.. However one carburator has been mentioned more than others and that is a Holley. IMHO... A Holley carburator is EZ to tune if U understand its basics, and its multiple internal parts are readily available..
Just my $0.02..
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