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Old 10-31-2003, 11:04 PM
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vac secondary carb or double pump???

In response to a previous post, willys36 and frisco both suggested that I switch to a vacuum secondary carb instead of the double pumper Holley I currently have on my 350. I searched through a couple of parts magazines and all I see as far as vacuum secondary carbs are single fuel line feeds. Would I not be losing power or performance by switching "down" to a single line instead of a double pumper???

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Old 10-31-2003, 11:41 PM
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I believe the Holley 3310 is a dual feed vac secondary.
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Old 11-01-2003, 08:03 AM
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Ditto, the Holly # 3310 is a vacuum secondary duel feed 750 carb and a very good one. A single line is just as good for all street apps.
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Old 11-01-2003, 08:07 AM
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1BAD80 is right. The 3310 Holley is a very good carb especially for street applications.
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Old 11-01-2003, 09:38 AM
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The 4160 series of the Street Avenger carbs are all dual feed single pumper vac secondaries.

Vince
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Old 11-01-2003, 09:40 AM
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Talking

Thanks all. I am checking on those suggestions right now.
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Old 11-01-2003, 09:48 AM
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I think you are confused, as are many, on what a double pumper is. It has nothing to do with fuel lines. Double pumpers have a mechanical secondary with an accelerator pump same as the primary side. They can be dual or single fuel line.

Chris
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Old 11-01-2003, 09:50 AM
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You are right. I just read about that on the Holley website. I just wanted to make sure going down to one fuel inlet wasnt going to cause me to lose performance.
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Old 11-01-2003, 11:45 AM
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Cool SINGLE VS DUAL

Even if you did buy a single feed fuel line carb it can be easily and fairly inexpensively switched to dual feed just by changing the fuel bowls to the correct dual fuel line setup.
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Old 11-01-2003, 02:24 PM
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In my photo album it shows both type of setups, single one on a set of 390 carbs and and the other feeding with two separate 650 Dps on page 2.
A single one feeds to the other bowl OK.
Single and duel can be had on most #4160 carbs.
There are after-market fittings to be put on carb to change gas line inputs, single to duel by changing it to a 4150 style and duel to separate.
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Old 11-01-2003, 02:53 PM
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It would take an INCREDIBLE engine to overdraw a single feed carburetor. We're talking several thousand horsepower. That shouldn't give you a second thought when choosing a carb.
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