Quick Fuel Technology Carburetor Spacer

Quick Fuel Technology Carburetor Spacers: Precision Engineered for Heat Control and Power

When it comes to carburetor accessories backed by genuine race-track development, few names carry as much weight as Quick Fuel Technology (QFT). "Innovators in fuel systems" is more than just a tagline — Quick Fuel Technology, since its inception in 1998, has grown exponentially, culminating into the benchmark by which performance carburetors are measured. That same engineering philosophy extends directly into their line of carburetor spacers, where thoughtful design choices make a real difference in how your engine breathes and stays cool.

Why Carburetor Spacers Matter

Taking steps to combat the effects of heat soak and vapor lock leads to improved all-around performance of an engine, and one of the most compelling methods is to use a carburetor insulator or spacer. Without separation between the intake manifold and the carburetor, heat can quickly permeate the carburetor and cause the fuel in the float bowls to expand and eventually boil or percolate. A well-chosen spacer is one of the simplest, most cost-effective upgrades a builder can make to protect a carbureted engine from heat-related fuel delivery issues.

QFT's Carburetor Spacer Lineup

QFT carburetor spacers are available in a variety of configurations — from the transition blend spacer, which merges open plenum with a four-hole design for better mid-range and high RPM power, to phenolic spacers, as well as anti-reversion and shear plate spacers. This range of configurations allows builders to tailor their selection to the specific demands of their engine package, whether that means maximizing top-end power on a race motor or smoothing out the mid-range on a street/strip combination.

• Phenolic Spacers: Designed to help isolate heat from the motor to the carburetor, QFT's phenolic spacers are a popular choice for builders looking for reliable thermal protection in a compact, lightweight form. Available in open-style and four-hole configurations for 4150-style flanges.
• Transition Blend Spacers: These units merge open plenum and four-hole geometry to broaden the power curve, helping deliver strong pull from mid-range into high-RPM territory — ideal for street/strip and bracket-racing applications.
• Anti-Reversion & Shear Plate Spacers: Anti-reversion plates and shear plates are designed to improve airflow and assist in atomizing fuel at higher RPMs, and the design helps improve signal to the carburetor and flatten the fuel curve.
• Quick Cool Insulator Kit (PN: 300-4013): The kit includes an aluminum heat shield, a poly-core spacer, a set of longer carb studs, nuts, and required gaskets — all in a 1/2-inch installed height profile designed to fit snugly under a factory hood.

Built by Racers, for Racers

QFT moved into the manufacturing side in the mid-2000s, producing their own branded products and becoming the first to introduce billet metering blocks and billet base plates to the aftermarket industry. That same commitment to in-house manufacturing and race-proven engineering is reflected in every spacer they produce. QFT spacer products are designed for 4150-style flanges and fit standard Street Demon, Holley, and QFT carbs, making them highly versatile across a broad range of popular carburetor platforms.

Whether you're building a dedicated bracket car, a weekend street/strip machine, or just trying to stop vapor lock on a hot summer cruise, Quick Fuel Technology's carburetor spacers offer the engineering depth to handle the job right. Browse the full carburetor spacer category or explore the complete Quick Fuel Technology catalog to find the right solution for your build.