Help!! Double Pumper or Vacuum Secondary carb????
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Help!! Double Pumper or Vacuum Secondary carb????

  1. #1
    Junior Member
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    Default Help!! Double Pumper or Vacuum Secondary carb????

    What carb do I want? Double Pumper or Vacuum Secondary?? And WHY????
    Stock 454 bottom end
    Peanut port heads
    Edelbrock Air Gap intake
    Comp Cams Marine cam 0.564 lift
    Its in 17.5 Cee Bee Avenger


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  3. #2
    Village Idiot fc-Pilot's Avatar
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    For applications that are for general fun and performance I prefer Vacuum as it is more forgiving being that it is not as sensitive to tuning. If you are looking for every last HP then a double pumper might be the way to go, but they can be more finicky with throttle response.

    Paul

    With what you have I would probably use a Holley 3310 as it is a 750 Vacuum secondary setup. If you have an open engine compartment and you don't have to worry about LEO bugging you about "marine hardware" I would go with something like this.

    Holley 0-3310C 750cfm Factory Refurbished Carb | eBay
    Last edited by fc-Pilot; 04-23-2012 at 05:10 PM.

  4. #3
    Super Moderator HammerDown's Avatar
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    Tested and tested my 850 annular DP, it gave a little harder hit but zero top speed gain or RPM and used a LOT more fuel > bigger and DP ain't always better.

    My Holly 715 vac secondary all around kicks ass. For my application I feel a 750 vs would be ideal.

    468, 049 heads nicely worked, roller Lunati Cam, Weiand Stealth, Aggressor full-A impeller = 5400 rpm
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  6. #4
    gn7
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    Like Hammerdown said, there is no reason a vac secondary can't deliever the same top speed as a similar sized DP. It may give up a little on a well tuned DP in acceleration. But it doesn't have to give up anything on top speed. It may need a secondary spring tuning to equal the DP on the top end, but thats about all.
    With a dual plan manifold and a mild performance engine, its not going to accelerate all that hard anyway.

    I would go with the vac seconday.



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  7. #5
    Senior Member Schiada 201's Avatar
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    X 2 Vacuum secondaries work well

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