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Re: 600/625 on a 440
[Re: Diplomat440]
#1580588
02/18/14 02:32 AM
02/18/14 02:32 AM
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Joined: Aug 2003
Posts: 12,291
Kent, Wa
340SHORTY
Truck Nut
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Truck Nut
Joined: Aug 2003
Posts: 12,291
Kent, Wa
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My dads old 67 New Yorker had a factory 1850 625 CFM Holley on it from the factory..
I am truckless..
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Re: 600/625 on a 440
[Re: Kern Dog]
#1580593
02/18/14 05:04 AM
02/18/14 05:04 AM
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Joined: Mar 2003
Posts: 18,678
Fresno, CA
Jim_Lusk
I Live Here
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I Live Here
Joined: Mar 2003
Posts: 18,678
Fresno, CA
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Quote:
Wasn't the factory Carter AVS used on 440 Magnum engines a 580 CFM ? The 340 used a 480 CFM. No wonder they made more power when a Holley 750 was swapped on !
Nope, Scott can probably add more, but the 440 HP AVS was a 750 and the 340 ran a 625...
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Re: 600/625 on a 440
[Re: Mr.Yuck]
#1580596
02/18/14 11:45 AM
02/18/14 11:45 AM
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Joined: Sep 2007
Posts: 14,889
up yours
Supercuda
About to go away
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About to go away
Joined: Sep 2007
Posts: 14,889
up yours
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You're the carb expert, you tell us.
In case/when Yuck gets it wrong. Yes it will work fine.
Max carb size is only relevant for max HP/RPM efforts. You are almost always better off choosing a smaller carb than a larger one.
They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.
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Re: 600/625 on a 440
[Re: gdonovan]
#1580600
02/18/14 12:42 PM
02/18/14 12:42 PM
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Joined: Sep 2007
Posts: 14,889
up yours
Supercuda
About to go away
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About to go away
Joined: Sep 2007
Posts: 14,889
up yours
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Did a little impromptu testing on my 87 Diplomat, 360, A833, 2.94 rear.
Ran an Ebrock 600 and an Ebrock 750. Numberswise, the smaller carb netted me low 20's for mileage and topped out at 115 mph. Larger carb netted me high teens for mileage and would peg the 125 mph cop speedo.
For the intangibles, the smaller carb felt more responsive, the larger felt somewhat lazy in comparison.
I did not optimize the tunes either, I might have picked a bit up but who knows. Since I did not regularly haul around at 115+ and was commuting 75 miles each way to work I kept the smaller carb on the engine. But that engine was not setup for high rpm running anyway. Comp XE262 cam, Performer intake, 302 heads, stock 3 cat exhaust.
They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.
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Re: 600/625 on a 440
[Re: 76dodgeboy]
#1580604
02/19/14 12:01 AM
02/19/14 12:01 AM
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Joined: Jan 2003
Posts: 5,327
Land 'O Lakes
RoadRunnerLuva
master
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master
Joined: Jan 2003
Posts: 5,327
Land 'O Lakes
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I used to have a mild (stock) rebuilt '69 440 in a C body Chrysler. The cam was the Mopar .455 lift hydralic,stock 906 heads with just a 3 angle valve job, 1-7/8 headers,CH4B intake, and a Carter 625 4 bbl. The car would fall flat in the upper (5,000) rpm range and run out of steam. I went back in it a year later, changed to the .509 cam, put a Holley 3310 750 4bbl on it, and it was a completely different car! Took it to a local track and did a best of 14.10 @101mph After that I always stuck with the Holley. 
Plymouth Makes It!
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The Lo Po BB got the smaller Holley vacune secondary carbs. 
