.110 Viton Needle & Seat

The MOROSO .110 Viton Needle & Seat (part number 65411) is a precision fuel delivery component designed for Holley carburetors rated up to 735 CFM. This pair of matched Viton needle and seat assemblies manages fuel flow at the carburetor's inlet, directly controlling fuel delivery accuracy and atomization quality. The .110 orifice sizing is engineered for specific CFM ranges and fuel pressure parameters, making proper specification critical for carburetor tuning and engine performance.

Viton sealing material provides superior resistance to modern fuel formulations, including ethanol-blended gasoline and alcohol fuels common in high-performance and racing applications. Unlike rubber compounds that can swell or degrade over time, Viton maintains dimensional stability and sealing integrity across temperature fluctuations and extended storage periods. The needle and seat work together as a float bowl shutoff valve; correct orifice size ensures precise fuel level control, preventing lean stumble, rich hesitation, and float bowl overflow conditions that plague mismatched components.

This replacement set is essential for anyone rebuilding or retuning a Holley carb, particularly when changing fuel pressure, upgrading to larger carburetors, or addressing fuel delivery inconsistencies. Carburetor enthusiasts, engine builders, street rod fabricators, and performance technicians routinely stock matched needle and seat pairs to accommodate different CFM requirements across their shop's inventory. The .110 specification suits mid-range Holley applications; verify your carburetor's original fuel inlet size before ordering to ensure compatibility and proper fuel pressure range.

Offered as a pair, these components arrive ready to install—no machining or modification needed. Proper needle and seat replacement is one of the first steps in any carburetor rebuild kit, preventing fuel level issues that can sabotage otherwise excellent tuning work.