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Offline Meyer

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Suggested carb size for a 426 hemi
« on: September 09, 2020, 01:22:22 PM »
Street driven
4 speed cuda 3:55 rear gear
Close to 600 lift solid roller
10:4-1 comp
Max rpm 6200

Holley says single 670cfm is that anough?

Linkback: https://forum.e-bodies.org/engine-transmission-and-rear-end/4/suggested-carb-size-for-a-426-hemi/18153/

Offline Oldschool

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Re: Suggested carb size for a 426 hemi
« Reply #1 on: September 09, 2020, 01:55:39 PM »
No, not enough for that engine. What intake manifold? I would suggest something like a Holley 950 HP for that car. It will use every bit of that - and then some.

Offline JS29

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Re: Suggested carb size for a 426 hemi
« Reply #2 on: September 09, 2020, 02:28:40 PM »
It has been said CID of the engine X 2=carb size.  :alan2cents:

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Re: Suggested carb size for a 426 hemi
« Reply #2 on: September 09, 2020, 02:28:40 PM »

Offline Cudino

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Re: Suggested carb size for a 426 hemi
« Reply #3 on: September 09, 2020, 02:38:10 PM »
Mopar Performance recommended 850cfm Holley Double Pumpers on their 472 and 528 crate motors, and 750cfm on their 426 crates.  Their 528 had 10.25:1 compression, dual-plane M1 intake, hydraulic lifters with .524/.543 lift.

- Wade

Offline RUNCHARGER

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Re: Suggested carb size for a 426 hemi
« Reply #4 on: September 09, 2020, 08:00:30 PM »
Single plane iintake or dual plane? Stock 426 Hemis ran dual 650's and didn't bog. I think those 950's flow less than an 850. I'd be tempted to run a 1050 Dominator for a single 4 application. I have run Hemis for decades and not once did I think "dang I wish I had smaller carbs".
Sheldon

Offline Chryco Psycho

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Re: Suggested carb size for a 426 hemi
« Reply #5 on: September 09, 2020, 10:23:00 PM »
Hemis move a lot of air , I would use a 950 CFM Proform as the smallest carb choice
 1050 Dominator is an awesome carb & I woule thinking about that for sure .
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Offline GCragtop

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Re: Suggested carb size for a 426 hemi
« Reply #6 on: September 10, 2020, 02:22:11 AM »
950 cfm if single 4 bbl. 2x600 cfm if dual carbs.

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Re: Suggested carb size for a 426 hemi
« Reply #6 on: September 10, 2020, 02:22:11 AM »

Offline RUNCHARGER

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Re: Suggested carb size for a 426 hemi
« Reply #7 on: September 10, 2020, 06:57:19 AM »
Again, what intake are you running? If it's the MP dual plane it might be best to put it up for sale before investing in a carb for it.

Offline Oldschool

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Re: Suggested carb size for a 426 hemi
« Reply #8 on: September 10, 2020, 07:44:03 AM »
Again, what intake are you running? If it's the MP dual plane it might be best to put it up for sale before investing in a carb for it.

I wonder if hood clearance is an issue? :thinking:

Offline Meyer

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Re: Suggested carb size for a 426 hemi
« Reply #9 on: September 10, 2020, 10:40:38 AM »
The stock aluminium dualplane it came with from mopar performance... it has a 4150 street hp 850 dp on it ...

It has a issue ! when cruising its 13.7 afr when accelerating alittle hard it leans it out ,unless i floor it and it overcomes the lean spot and the sec kicks in...

The acc pump cam / nozzles has been switched back and forth but nothing is changed...

Has a 5,5 power valve in it

Offline Brads70

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Re: Suggested carb size for a 426 hemi
« Reply #10 on: September 10, 2020, 11:09:18 AM »
Simple thing but is the pump arm adjusted ok?  :notsure:

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Re: Suggested carb size for a 426 hemi
« Reply #10 on: September 10, 2020, 11:09:18 AM »

Offline Meyer

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Re: Suggested carb size for a 426 hemi
« Reply #11 on: September 10, 2020, 12:35:02 PM »
Yes its not a off idle stumble... wich a miss adjusted pump does

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Re: Suggested carb size for a 426 hemi
« Reply #12 on: September 15, 2020, 11:38:02 AM »
???

Offline Chryco Psycho

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Re: Suggested carb size for a 426 hemi
« Reply #13 on: September 15, 2020, 05:06:23 PM »
So what is the intake vacuum idling , in gear if Auto , the power valve should be at least 1.5 " below that reading , What about the secondary accel pump what size pump shooter & cam . as the secondaries are quickly opened it can go lean if there is not enough pump shot , you might need a 50 cc pump / if you are near .040 shooter you might need a hollow screw , I would want a pump cam that delivers a lot of fuel fast not a long duration shot , do you have enough jet size in the rear so when the pump shot is done you still have adequate fuel through the boosters ?

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Re: Suggested carb size for a 426 hemi
« Reply #14 on: September 15, 2020, 10:09:51 PM »
30cc acc pumps
31 nozzles
orange pump cams in no 2 position
9hg at idle
7 power valve
78 front jet
88 rear jets

13.1 wot afr
13.8 cruise afr

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Re: Suggested carb size for a 426 hemi
« Reply #14 on: September 15, 2020, 10:09:51 PM »

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