Mechanical? or vacuum secondaries?
Moderator
Joined: Dec 2001
Posts: 22,436
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From: Louisville,Ky.
It really depends on the application.
There are a couple of different set-ups of mechanical secondaries.
There is the Holley type that uses dual accelerator pumps (double pumper) and there is the mechanical type with a secondary air flap such as Edelbrock (AFB/AVS) q-jet and the Motorcraft 4100/4300 series.
For a heavy vehicle with an auto tranny, all but the double pumper will work fine.
A double pumper is recommended for a light vehicle with a high stall converter or a manual tranny.
What are you wanting to change the carb on?
There are a couple of different set-ups of mechanical secondaries.
There is the Holley type that uses dual accelerator pumps (double pumper) and there is the mechanical type with a secondary air flap such as Edelbrock (AFB/AVS) q-jet and the Motorcraft 4100/4300 series.
For a heavy vehicle with an auto tranny, all but the double pumper will work fine.
A double pumper is recommended for a light vehicle with a high stall converter or a manual tranny.
What are you wanting to change the carb on?
Posting Guru
Joined: Feb 2004
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From: Jackassville
Unless your building a drag engine, get the vacum secondarys, ive heard of nothing but trouble with the double pumpers. Double pumpers are for race engines, they dont work good on street vechiles.
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From: Louisville,Ky.
I like the Edelbrock carb on my 460. I would go with a 600cfm. If you do a lot of off-roading though, the Holley truck avenger 670 would be better due to the floats are less apt to bounce around and cause fuel issues. For mostly street driving, the Edelbrock will give better low end throttle responce and gas mileage.
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Moderator
Joined: Dec 2001
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From: Louisville,Ky.
The Holleys will give you more peak power, but for everyday driving, the Edelbrocks are easier to tune and give better mileage and low end torque and throttle response. Yes, both are good carbs, just depends on the application.
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