460 carb choice
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460 carb choice
I have a 78 460 out of an Alabama Law car in a 76 f250 4wd 4spd. I am either going to have the motorcraft 4bbl rebuilt or replace it with an Edelbrock 750 performer electric choke. Which is a better option?? Also, what size is the motorcraft 4bbl, it is the stock carb off the motor?
Post Fiend
Joined: Mar 2004
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From: Union, Washington
The Holley carbs that came on the 460s were all 600CFM carbs. I don't know for a fact, but the Motorcraft carbs were suppose to be 650CFM but never worked very well. What carb is pretty much up to you (I prefer a Holley over any other) and the sized pretty much depends on what mods done to the motor and what the rev limit will be (dictated by the cam, intake, heads and exhaust system). If the motor is stock a 600 is more than adequate to the task.
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Fleet Mechanic
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From: Hesperia, CA
I ran the 600 on mine and changed to the 750. I do a lot of towing and the change was like turning the lights on. The surprise to me was that the gas mileage actually went up a little, both towing and solo. The only mods to my engine are a MSD ignition system, roller rockers, the exhaust ports opened up and the exhaust system changed to a two into one Flowmaster.
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If any given cfm carb is tuned properly to the motor, the 600 will work the best for a stock or overbored only, under 5000rpm operated, 385 series motor. The bigger carbs give you the "illusion" you are making more power becouse it takes a little less throttle. My favorite carb for the 429/460 is the basic Holley 1850 600cfm vacuum secondary carb. I am going to pick up a 650 cfm spreadbore Holley and see how that works. Hoping I can get a little more MPG, when empty, out of it.
Post Fiend
Joined: Mar 2004
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From: Union, Washington
Originally Posted by Pre'80
If any given cfm carb is tuned properly to the motor, the 600 will work the best for a stock or overbored only, under 5000rpm operated, 385 series motor. The bigger carbs give you the "illusion" you are making more power becouse it takes a little less throttle. My favorite carb for the 429/460 is the basic Holley 1850 600cfm vacuum secondary carb. I am going to pick up a 650 cfm spreadbore Holley and see how that works. Hoping I can get a little more MPG, when empty, out of it.
The spread bore 650 with it's smaller primaries may well improve low end throttle response and increase your mpg because of the higher air velocity thru the venturis at low to mid-range throttle settings.