427 stroker carb
Thread Starter
Instructor
Joined: Feb 2014
Posts: 228
Likes: 2
427 stroker carb
building a 427 stroker and need advise on which carb. I have afr 210 heads, 10.5 comp ratio, haven't picked the cam yet but it will be on the wild side. it has an auto trans 377 rear and will be for street only. I called Holley and they recommended the 770 street avenger but the reviews are not that good. any help?
Racer
Joined: Jul 2011
Posts: 265
Likes: 77
From: chicagoland il
building a 427 stroker and need advise on which carb. I have afr 210 heads, 10.5 comp ratio, haven't picked the cam yet but it will be on the wild side. it has an auto trans 377 rear and will be for street only. I called Holley and they recommended the 770 street avenger but the reviews are not that good. any help?
Racer
Joined: Jul 2011
Posts: 265
Likes: 77
From: chicagoland il
In your case 427/2 x 6000/1728= 742cfm Naturally running large cams, higher rpm, your set up will change this.
Race Director
Joined: May 2005
Posts: 10,674
Likes: 121
From: Millington Illinois
St. Jude Donor '08-'09
Im glad to see your head choice! 
http://www.summitracing.com/parts/hl.../applications/ With a comprehensive chassis dyno tune is the way I would go.
I know the 850 sounds big but this is basically the same carb used on an L88 with an electric choke and some upgrades. Your at similar power levels. The beauty of the vacuum secondary carb is it can be jetted for correct A/F ratio. adjusted to your vacuum specs and the vacuum secondary will only give it what it needs when it needs it. Your VE will be a lot higher than most of the calculators or Holley tech support will figure. If you want to go more conservative look at this.
http://www.summitracing.com/parts/qf...0-vs/overview/
http://www.summitracing.com/parts/hl.../applications/ With a comprehensive chassis dyno tune is the way I would go.
I know the 850 sounds big but this is basically the same carb used on an L88 with an electric choke and some upgrades. Your at similar power levels. The beauty of the vacuum secondary carb is it can be jetted for correct A/F ratio. adjusted to your vacuum specs and the vacuum secondary will only give it what it needs when it needs it. Your VE will be a lot higher than most of the calculators or Holley tech support will figure. If you want to go more conservative look at this.
http://www.summitracing.com/parts/qf...0-vs/overview/
Last edited by 63mako; Mar 8, 2014 at 12:28 PM.
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Safety Car
Joined: Oct 2004
Posts: 3,920
Likes: 731
From: Youngstown Ohio
I have a 427sb, AFR 210s, and use a QuickFuel 950 (jetted and tuned for my combo of course). Your carb choice should be dictated by your engine horsepower and RPM capacity as well as cubic inches. You need more CFM than the "standard formula" indicates for a hi-po engine like yours.......close to 2 cfm per horsepower is the rule of thumb.
Anyone who doesn't like QuickFuel, but loves Holley, doesn't strike me as knowing much, since they are really the same carb, just tuned differently. Either way, get a carb that flows a true 850-1000 cfm, depending on your horsepower.
Anyone who doesn't like QuickFuel, but loves Holley, doesn't strike me as knowing much, since they are really the same carb, just tuned differently. Either way, get a carb that flows a true 850-1000 cfm, depending on your horsepower.
Safety Car
Joined: Jan 2009
Posts: 4,000
Likes: 299
From: New York
I have a 427sb, AFR 210s, and use a QuickFuel 950 (jetted and tuned for my combo of course). Your carb choice should be dictated by your engine horsepower and RPM capacity as well as cubic inches. You need more CFM than the "standard formula" indicates for a hi-po engine like yours.......close to 2 cfm per horsepower is the rule of thumb.
Anyone who doesn't like QuickFuel, but loves Holley, doesn't strike me as knowing much, since they are really the same carb, just tuned differently. Either way, get a carb that flows a true 850-1000 cfm, depending on your horsepower.
Anyone who doesn't like QuickFuel, but loves Holley, doesn't strike me as knowing much, since they are really the same carb, just tuned differently. Either way, get a carb that flows a true 850-1000 cfm, depending on your horsepower.
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,062
From: altered state
St. Jude Donor '05
Been super happy with AED they will custom tailor it to your cars motor gear weight etc.
Give jeff a call in sales over there, service is first rate after the sale. Would buy another tomorrow!
They will select the proper one for you
Give jeff a call in sales over there, service is first rate after the sale. Would buy another tomorrow!
They will select the proper one for you
Burning Brakes
Joined: Sep 2012
Posts: 818
Likes: 0
From: coon rapids mn
I like the billet base plate of the quick fuel,or the speed demons .the quick fuels are a great carb for the money .if you are mostly street driving a quick fuel 750 is a good choice .pick the carb after you settle on the cam .then you have a ideal of you hp potential ,and what carb you mite need .what intake are you going with ?I wouldn't recommend a 850 carb with a dual plane .
Heel & Toe
Joined: Dec 2013
Posts: 21
Likes: 0
From: in
Im going to say call Patrick from Pro Systems, he custom builds a carb for your combination and wet flows it and sends a build sheet with it. He has great customer service also in case of any problems. I have used his carbs in the past and it was a bolt on and hit the ignition and it ran perfect.
Thread Starter
Instructor
Joined: Feb 2014
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Race Director
Joined: Apr 2000
Posts: 17,654
Likes: 190
From: Who says "Nothing is impossible" ? I've been doing nothing for years.
You could go with the 750-850 classic Holley DP, it will work and they are not expensive. If they are still selling Demon carbs I would look for the 750 Dp with annular boosters, love mine, the 750 Demon will flow near 900cfm in comparison to the Holley carbs.
Race Director
Joined: May 2005
Posts: 10,674
Likes: 121
From: Millington Illinois
St. Jude Donor '08-'09
Here is a great deal. The Holley refurbished carbs are checked more thoroughly than right off the line and you save over $100. I have bought these direct from them with great results. 90 day full warrantee.
http://www.ebay.com/itm/Holley-0-805...-/351009677219
http://www.ebay.com/itm/Holley-0-805...-/351009677219
Last edited by 63mako; Mar 9, 2014 at 04:45 PM.