.110 Viton Needle & Seat - Pair

The .110 Viton Needle & Seat - Pair from Advanced Engine Design is a precision fuel delivery component engineered for high-performance carburetors used in street and racing applications. This matched pair is specifically designed for Holley and Quick Fuel carburetor platforms, where fuel metering accuracy directly impacts engine performance, throttle response, and fuel economy. Whether you're tuning a classic muscle car, bracket racer, or street rod, a fresh needle and seat assembly is essential maintenance that restores proper fuel atomization and prevents lean or rich conditions.

The .110 orifice specification denotes the fuel passage diameter through the metering circuit, directly controlling fuel volume at idle, cruise, and wide-open throttle conditions. Constructed from Viton elastomer, the seat provides superior heat and fuel chemical resistance compared to standard rubber materials, ensuring consistent sealing across extended operating temperatures and modern ethanol-blended pump fuel. The needle component is precision-ground to micro-tolerances, allowing repeatable fuel cutoff without float bowl overflow or starvation—critical for maintaining stable air-fuel ratios during acceleration, cornering, and sustained high-RPM operation.

This pair is ideal for rebuilding worn carburetors or upgrading older units where fuel delivery has become inconsistent. Mechanics and engine builders commonly replace needle and seat assemblies during carburetor overhaul to eliminate float bowl leaks, correct idle quality issues, and optimize jetting response to custom ignition and intake modifications. Installation requires removing the fuel inlet fitting and bowl—a straightforward procedure for those with basic carburetor experience. Verify your carburetor model against Holley and Quick Fuel compatibility charts before ordering to ensure correct seating diameter and thread configuration.