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  #16 (permalink)  
Old 06-24-2013, 10:37 AM
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Living At The Speed Of Life
 
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Speed Demon 750 vac secondaries

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  #17 (permalink)  
Old 06-24-2013, 10:44 AM
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I have had a speed demon and also a migty demon carb before and they are not really any different then a holley except the mighty demon came with screw in air bleeds and had the ability to change the idle feed restrictions and power valve restriction in the metering blocks but they are not really a different design then a holley as they are a little different in shape with the ones that have the choke tower and demon's weird choke shape. They still tune just like a holley style carb as that is basically what they are. The road demon 625 is basically a same design as the holley 600 vacuum secondary just looks different and the demons are usually made with a richer fuel curve at least when barry grant owned them. Since holley got all the stuff to own them I have no idea how they are done now. Either one will do about the same for your application. My brother had a stock 305 sbc and with a holley 600 vs carb it ran just as good with the old qjet that was on it and did not get quite as good mpg it was still very close. One quick edit the demon carbs do offer somewhat of a better airflow through the venture as that is one plus over the basic holley design but is really nothing on a street motor.

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  #18 (permalink)  
Old 06-24-2013, 12:36 PM
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  #19 (permalink)  
Old 06-24-2013, 01:10 PM
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I reiterate 650 double pumper,,,
WHY?
most simple carb,can be bought with removable air bleeds
all the parts are available at all parts stores that sells carb parts,,,its the small block chevy of carbs
I agree that fuel injection is superior
I believe that the "webber" carb is probably better than the holley (no way cheaper)
The Q-jet is great but very complicated to tune if you are not familiar with the systems(or maybe you get a free BB carb thats stagger jetted and have tuning night mares and dont know why.)?
double pumper is not for fuel efficiency(think of it as 2 progressive carbs that just happen to be bolted together.
The choke system is poor on the double pumper carbs
The demon carbs use "A.N." fittings that are a little inconvenient as they are special to Demons.
you can buy a 650 double pumper spread bore,though I dont see any reason for it.
Fuel economy is usually determined by the right foot.
the 650 will support engine power to 400 plus HP.
Is a 650 the best?
only you can determine that?I use bigger carbs generally and dont tune double pumpers for daily drivers,,"usually"

blah blah blah,,,lol.
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  #20 (permalink)  
Old 06-24-2013, 02:01 PM
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Quote:
Originally Posted by vinniekq2 View Post
I reiterate 650 double pumper,,,
WHY?
most simple carb,can be bought with removable air bleeds
all the parts are available at all parts stores that sells carb parts,,,its the small block chevy of carbs
I agree that fuel injection is superior
I believe that the "webber" carb is probably better than the holley (no way cheaper)
The Q-jet is great but very complicated to tune if you are not familiar with the systems(or maybe you get a free BB carb thats stagger jetted and have tuning night mares and dont know why.)?
double pumper is not for fuel efficiency(think of it as 2 progressive carbs that just happen to be bolted together.
The choke system is poor on the double pumper carbs
The demon carbs use "A.N." fittings that are a little inconvenient as they are special to Demons.
you can buy a 650 double pumper spread bore,though I dont see any reason for it.
Fuel economy is usually determined by the right foot.
the 650 will support engine power to 400 plus HP.
Is a 650 the best?
only you can determine that?I use bigger carbs generally and dont tune double pumpers for daily drivers,,"usually"

blah blah blah,,,lol.
more after market pieces for holleys

I would argue the VS holley 600 is the "small block chevy of carbs" as they are the most common of all the ones mentioned. Parts availability for holleys is indeed superior, no one can argue that- but that may or may not be the driving factor. parts availability for keihin carbs sucks compared to holleys, but they work great, go figure.
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