4500 vs 4150

I'm wondering about the streetability of a 4500 vs a 4150 carburetor. The motor is a 528, 13.3 compresssion, Blue Thunder heads, XR-292 roller and will be running E-85 for fuel. If I opt for a Dominator do I want a 2 or 3 circuit carb. Since the car will see more street time than strip I'm more interested in driveablity than maximum HP.

Like my 2 circuit 1050 Dom. all street runs real nice . 521 SCJ , XR 292R etc . Was built by these guys http://www.performancecarb.com/

They got me sorted after lots issues with a 3 circuit Demon

Dominators have the ability to adjust the progressive ratio where you can make them come in late for the street or early for the track. The HP series Holleys have a fraction of that feature. Streetability is more about power and weight for a car that gets mostly track use and a little grocery getter life.

A Dominator, (even a 3 circuit, though more dificult), can be made to run fine of the street with an everyday type vehicle, too ... if you don't need a choke.

FYI the linkage names are a little funny.

Soft progressive linkage opens secondaries early and slowly

Progressive linkage is more like a regular 4150. Secondaries open later and quicker.

I just switched from a 950 to a 2 circuit 4500 1050. I have not driven it, (been too cold) but have run it in the driveway. Idles clean and throttle response is NOW. Can't wait to make a pass with it.

Here's a link to my carb build:

http://motorsportsvillage.com/forum/viewtopic.php?f=6&t=9704&sid=a422988d8d45fe838ff5b71d020162e1

Okay, Dominator it is. Is there a specific model number carb I should be looking for? I'm not a carburetor guy and will be having it converted to E-85 so I'd like to get the right carb, not just any old Dominator.

Quick fuel makes an e85 4500. I have had very good luck with both the 4150 & 4500.

I have yet to put a 4500 carb on a decent engine over 450 ci and not see a performance improvement. As mentioned the 2 circuit carbs seem to work better on the street.

A 2 circuit 1050 with P.V. in the primary side works good . I've used the FX-4700 several times with good results....pump gas application.

Lem spec'd a 4700FX for my 557 pump gas engine and it ran like a banshee. Very good street ability .

It's for sale too ( shameless plug )

John Myrick wrote:Lem spec'd a 4700FX for my 557 pump gas engine and it ran like a banshee. Very good street ability .

It's for sale too ( shameless plug )

Sounds like a perfect storm