I saw in this website that a manifold that accepts a single holley downdraft carb instead of dual sidedraft carbs. does anyone know what the difference is? does it give you more horsepower than dual sidedrafts? well if ne one nos plz respond

I'm not sure what you mean when you write.
"THAT a manifold THAT accepts a single Holley downdraught carb instead of dual sidedraught carbs"

The simplistic answer is that what you saw, or read about, is an inlet manifold that mounts what i presume to be a two barrel, staged Holley carb. These carbs are of an upright design in which the airflow comes in from the top & flows "down"
The other type of carb is of a horizontal design, usually mounted with a slight slope, where the air flows horizontally, usually from the side of the car.
There are exceptions when these carbs are used in front drive applications on cross mounted engines & the air flows either from the front, or rear of the car, but these are still called "sidedraught" carbs as the air still flows in from the "side" of the engine.

For street use, the downdraught design will give good useable power, & the original Hitachi's were of this type.

Dual sidedraughts will normally permit a higher maximum airflow, without the need for the incoming charge to take a few bends on the way in. This usually means a higher maximum output, but does not automaticly guarantee a smooth flexible engine. The sidedraughts will fit under a low hood, or bonnet too, where a downdraught might not.

Hi,
I'm not quite sure what you are asking but I gather you are comparing downdraughts to side draughts.
For outright performance side draughts are definately better as it has a faster more direct flow into the cylinder head.
Downdraughts have to flow down through the carb, then turn into the manifold - if you can understand that.
It depends on how much power you want / can use?
As has been discussed heaps before here downdraughts such as the weber 32/36 are fine on mild street engines but if its outright performance at higher rpm go a side draught.
Hope "my opinion" helps

ApHaSia4504, the Holley 5200 is the same design as the Weber 32/36. Holley 5200s were made under Weber license, and appeared on Ford 2.3 liter engines up into the 80s and also on the Chevrolet Vega.

The "manifold that accepts a single Holley downdraft" is the stock Datsun 1200 intake manifold, we just use an adapter plate to bolt the bigger carb on it.

the correct spelling is wholley
designed around a bucket with a whole in it
and not much better.
I've owned numerous model holleys and now I wouldn't have one if you give away

Sunny is that your car in your sig? It looks great in the small pic and I'd like to see more!

Sunny said: Quote:Well, Sunny did you know that the Holley 5200 was designed by Weber? These US-manufacturered carbs were very reliable.

I can only agree with Dave Gonzales.

I have had 1200's, a Sunny and now a 200B.
All of these have been street cars (daily drivers) and they all have had the standard carb replaced with a 32/36 Weber.

You better believe that the Weber is far, far superior to the standard.

I'd like a dollar for every Weber/Holley installation!

I'd probably go and buy another Weber.

I wish it was that shinny and 2dr sedan
no i'm sad to say it's not .I think its the nicest b310 i've seen and the first 2dr sedan
I don't think AU got these
mines a little gloss impared at the moment