Quick Fuel Technology 7-40QFT 6-32 Screw-in Restriction .040"

The Quick Fuel Technology 7-40QFT is a precision-drilled 6-32 screw-in emulsion restriction designed for carburetor calibration and fine-tuning. This .040" orifice restriction is machined from brass and allows for precise control of air bleed and emulsion circuits in Holley-style and Quick Fuel carburetors.

Key Features:

• Precision drilled to .040" (0.040 inch) specification for accurate fuel metering
• Standard 6-32 thread for easy installation in metering blocks
• Brass construction for durability and corrosion resistance
• Allows fine-tuning of air/fuel ratio across the RPM range
• Helps optimize carburetor performance for specific engine applications
• Sold as a pack of 4 restrictions

Emulsion restrictions control the mixing of air and fuel within the carburetor's metering circuits, affecting fuel curve characteristics throughout different engine speeds. Changing restriction sizes allows tuners to dial in precise air/fuel ratios for improved throttle response, drivability, and performance. The part number designation follows Quick Fuel's naming convention: the prefix "7-" indicates an emulsion restriction, while "40" represents the orifice size in thousandths of an inch (.040").