Carburetor recommendations???

[shnookie]

I need a recommendation for a carb. for my car. I was originally going to run Holley Projection but have decided against it for a number of reasons. Maybe I'll change my mind once I have some miles on it, but for now I want to get the engine in and get it RUNNING. Here are the Specs:<br>
460 bored .020 over / 9.5 compression / eagle rods<br>
556/581 lift / 234/244 duration / 108 lobe sep. cam <br>
Hydraulics with roller tips<br>
Edelbrock 75cc performer RPM alu. heads / port matched<br>
Performer RPM manifold <br>
I'm thinking about running an 870CFM Holley Street Avenger
but don't know anything about this carb. (Last new carb I used was a 4150) or a 870 Barry Grant Annular Race Demon. Do you think this is too much carb? (Remember I'm at 5,200 feet)
Any opinions or suggestions?

[cobralee]

If this is primarily a street driven car, I would recommend running a 850cfm street demon. I think your cubes and heads lends itself. Its a great carb.

[Roscoe]

Take a look at Barry Grant Demon Carbs or AED Carbs.

http://www.bgfuel.com/default.aspx
http://www.aedperformance.com/

Roscoe

[Hydramada]

Speak to the folks at Jet Performance Products about thier Stage 3 carbs. They start with a factory Holley 4150 and finish the job that Holley should have done in the first place.

www.jetchip.com

STAGE1 - A Stage 1 Holley® 4 BBL vacuum secondary beings with the disassembly and inspection of the carburetor for proper sizing of the idle, transition, acceleration and main metering circuits. The main body and metering blocks checked for straightness, boosters are aligned in the venturi and the throttle bores are aligned for proper seating. The carburetor is then reassembled using the highest quality parts and minor calibration changes may be made if deemed necessary by our technicians.


STAGE 2 - A Stage 2 features all the modifications of a stage one plus; the fuel metering circuits are inspected, blueprinted and then calibrated to match any modifications done to the engine such as intake manifold, headers, ignition or cam change, and intended use of the vehicle. The air horn is milled to improve and equalize airflow between the primaries and secondaries (optional). A quick change cover kit is optional and allows changes in secondary opening rate in mere seconds. An optional secondary metering block allows the secondary jetting to be adjusted as well as the primaries. These features are standard on JET supplied Stage 2's and optional on customer supplied carburetors. Electric choke and four corner idle circuits are optional on all Stage 2 carburetors.


STAGE 3 - A Stage 3 is intended for high performance pro street style vehicles and racing applications. All Stage 3 carburetors include all of the Stage 1 & 2 modifications plus radiused air inlet area and modified venturis for greatly increased airflow, modified discharge boosters for increased signal strength and atomization, machines throttle shafts, four corner idle circuits, fully modified metering blocks, modified floats and high flow needle and seats. A secondary quick change kit and rear metering block are standard on all Stage 3 vacuum secondary carburetors. These carburetors are custom tuned and calibrated for each specific application. Electric choke is optional on all Stage 3 carburetors.

Call For Pricing... Qty:

[Tom Wells]

Uh guys,

If I was going to use a carb, I would not choose a Demon. I tried for several months to get an 850 Speed Demon vacuum secondary carb to work on my mild 521. Took it to experts. Called, wrote and visited BG in Dahlonega. No joy.

Finally switched to fuel injection.

Were I to do it over again I'd try anything but not a Demon...



Tom

[Mr.Fixit]

I agree with TOM,

I don't like the Demon's, I would much rather have a Holley brand Holley carb.

Shnookie, an 850 double pumper is about what you want. A larger CFM carb may get you a little more top end HP, at the expense of low end throttle response. How modified? depends on budget. I do prefer downleg boosters over straight, annulars are even better, usually.

[Tongue Pirate]

Demon! Yes! But don't get the vacuum secondary carb!

Holley, Yes! Get a good Double Pumper for the street or spend some $$$$$ if you are going to compete.

In my experience with Carburetion, especially on performance cars, vacuum secondaries aren't where the golden goose lies. Unless your woried about fuel economy

[coyled]

Schnookie, what rear gears are you running? I would have a carb shop custom taylor one for your application as stated above. The rear gear can help determine how aggresive the carb metering will be. Good luck, Scott.

[66 snake]

I'm running a 418 stroker with a Divinci HP 950 seems to be a good combo, you might look in that direction, you also could give them a call tell them what your application is and get ther recomdations.

If you call try to talk to David.

[L.M.Lind]

There is an article in March 2003 Kit Car magazine titled "Selecting the right carburetor". The author talks about bigger is not always better. It's a decent article on this subject. I run a 600cfm Holley performance carb in a '65 327/365hp vette and it performs great. Good luck with your build! Len

[Tongue Pirate]

I had a 425 hp BigBlock chevy in a 1959 Cadillac with a 4667-2 holley 600 cfm double pumper. It ran really well. Very responsive. It did lack a little on the top end(wonder why?) but who needs to go over 120 in a 19', 5000lb car?

[Roscoe]

I've got a mechanical Speed Demon that worked great right out of the box. Easy to tune, easy to maintain. Would do it again.
Roscoe

[sparks]

i have to agree w/roscoe . my demon 850 has given me no trouble on my 460. very easy to adjust........putting out 550 hp and 560lbs. of tq......with very smooooth acceleration.

[shnookie]

Sorry:
Here is the rest of the information.
Richmond 5 street 5 speed.
3.27 rear IRS gears
All top speeds at 6500 RPM
1st.....52MPh
2nd ...80
3rd...108
4th...138
5th...171

75 MPH @ 2400 RPM in overdrive