.130 Steel Needle & Seat

The .130 Steel Needle & Seat from Moroso is an essential fuel system component designed for carburetor enthusiasts and performance builders who demand precision fuel metering. This needle and seat assembly controls the critical flow of gasoline into the carburetor bowl, making it fundamental to engine idle quality, throttle response, and overall drivability. Whether you're rebuilding a classic muscle car, tuning a street rod, or maintaining a high-performance racing engine, a properly functioning needle and seat directly impacts fuel delivery consistency and prevents flooding that can foul plugs and waste fuel.

Constructed from hardened steel, the .130 diameter needle provides durability and precise seating surface contact that resists wear under continuous cycling. The steel needle design excels in high-performance applications where aluminum alternatives may experience accelerated erosion from fuel additives and extended operating temperatures. Moroso's manufacturing tolerances ensure a tight, consistent seal that minimizes fuel bypass and maintains stable float chamber pressure—critical for carburetors running at elevated boost levels or in competition environments. The compact 3.7 x 0.7 x 5-inch profile facilitates straightforward installation in most conventional carburetor housings without modification to mounting bosses or fuel bowl galleries.

This replacement needle and seat assembly suits anyone diagnosing fuel system lean stumbles, flooding at idle, or inconsistent idle stability after carburetor service. Mechanics and engine builders routinely swap worn needle-and-seat assemblies during full carburetor rebuilds to restore factory precision and eliminate fuel delivery variables from tuning equations. The .130 size is compatible with Moroso carburetors and many conventional domestic carburetor applications; verify your specific carburetor specification against the manufacturer's recommendation before ordering to ensure proper fitment and sealing integrity.