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Quick Fuel Technology Q-500-CT 500 CFM 2-Barrel Circle Track Carburetor

(Ford F-150 1975-79, 1984-87, Mustang 1964-73, 1983-85, F-250 1955-66, 1973-79, 1983-87, Bronco 1984-87, Thunderbird 1955-76 + 581 more models)

Manufacturer

Picture for manufacturer Quick Fuel Technology

Part Number

Q-500-CT
19 reviews
Sale Price

$819.95

4 left at this price

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Usually delivered within 2 days

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Product Details

The Quick Fuel Technology Q-500-CT is a purpose-built 500 CFM 2-barrel circle track carburetor designed as a direct replacement for Holley 4412 carburetors in gauge rule racing applications. This carburetor features 'LIST 4412S' stamped into the choke horn and utilizes genuine Holley main body, baseplate, fuel bowl, and metering block components, making it approved for most gauge-rule circle track regulations.

Circle Track-Specific Design:

  • Die-cast aluminum fuel bowls with internal baffles eliminate fuel slosh during high-speed banked turns
  • Integrated fuel chute substantially reduces aeration and directs fuel toward the main jet pickup area
  • Screw-in air bleeds enable precise fine-tuning of both low- and high-speed fuel systems
  • Proprietary booster design enhances carburetor signal without restricting high-RPM airflow
  • Adjustable QuickLink system allows changing secondary opening rate to 40%, 60%, or 100%

Premium Construction Features:

  • Roller bearing throttle shaft seals provide smoother throttle response and longer service life
  • CNC-machined throttle body for exacting tolerances and exceptional strength
  • Stainless steel throttle plates for durability
  • Sight glass windows for easy float level adjustment
  • Dual 7/8-20 inch thread fuel inlets
  • Lightweight aluminum construction reduces weight compared to competitors

The Q-500-CT eliminates the guesswork of modifying street carburetors for circle track use, offering substantial advantages in adjustability, consistency, and predictability. This carburetor is legal for racing, off-road use, or pre-1966 vehicles only—not legal for emissions-controlled highway use.

Products specifications

Fits

Ford F-150 1975-79, 1984-87, Mustang 1964-73, 1983-85, F-250 1955-66, 1973-79, 1983-87, Bronco 1984-87, Thunderbird 1955-76, F-350 1955-79, 1983-87, Galaxie 500 1962-64, 1968-74, F-100 1955-66, 1973-76, 1979, Fairlane 1955-70 + 577 more models

Barrel Quantity

4

Barrels

2

Billet Color

Diecast-No Billet

Booster

Straight

Brand

Quick Fuel Technology

Carburetor Use

Performance and Race

Category

Air and Fuel Delivery

CFM

500

Choke

None

Choke Type

None

Circuit

2

Condition

NEW

Cubic Feet Per Minute Rating

500

Emission Code

3

Finish

Zinc

Flange Type

Square/4150

Fuel

Gasoline

Fuel System

Carbureted

Gasket Or Seal Included

Yes

Grade Type

Performance

High Speed Air Bleed

33

Idle Air Bleed Size

73

Linkage Attached

Yes

Marine Use

No

Material

Aluminum

Model

Q-Series

Part Type

Carburetor

Primary Main Jet

74

Primary Power Valve

45

Primary Pump Nozzle Size

31

Product Type

Carburetor

Secondaries

None

Sub Category

Carburetion

Supercharged Application

No

Throttle Bore

1-11/16 inch

Warning

California Proposition 65

Warranty

Manufacturer's Limited 90 Day Warranty

had the parts required at a competitive price with free shipping, whats not to like.. ;)

So far so good

Quick and easy.

Excellent

fast easy checkout good prices

Great thanks

Great product value

great transaction!

good site

They had great email communication and shipped my items from order number 14199 very quickly. I was very impressed with how they handled my order.

Damn fast on the shipping and great price on the item a great place to shop

Great company to order from! Low prices, wide variety of merchandise, and quick shipping!

you guys always beat summit, some sort of shipping discount on larger orders would be nice though. Maybe an amazon prime type thing.

I was looking for a present for my husband, and Autoplicity had the items way cheaper than any other site. And then I messaged them to see if they had any coupons available, and I was sent a coupon code right away. I will definitely shop here again for auto supplies.

best price i can find. shipping scheduled only 4days after i order. haven't received it but looks fast.

Great prices, quick ship thanks!

This was my second order with Autoplicity. The first order I had to call to get an update, but just happens the part was out for delivery the day I had called. This second order went without a hitch! In both cases, shipping was fast and the products delivered at great prices, not to mention some of the best prices on shipping. I will definitely look here for my future parts needs!!

i was advised by all internet sources, and the manufacturer that the part i needed was out-of-stock and discontinued, when i used google shopping, autoplicity not only had the part but they were the most reasonably priced! my order was delivered to my door in 3 days. color me a satisfied customer, and yes i will used autoplicity again, soon!

Autoplicity has really good service. They give you such good prices and yet they're still willing to give you discounts on your purchases. They emailed me a day later after purchase with shipping number. I would recommend them to anyone!

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