.120 Trick Hi-Flow Needle & Seat - Each

The .120 Trick Hi-Flow Needle & Seat from Advanced Engine Design is engineered for serious carburetor tuners and high-performance engine builders seeking maximum fuel delivery precision. This adjustable needle and seat assembly is purpose-built to replace OEM restrictive components in Holley and Quick Fuel carburetors, unlocking the fuel bowl's full potential during aggressive tuning. Whether you're dialing in a street machine, competition engine, or custom build, this needle and seat delivers the flow characteristics needed to support higher cfm demands and optimized jetting curves.

Constructed with a 0.120 orifice diameter and Viton sealing material, the .120 Trick Hi-Flow Needle & Seat minimizes fuel starvation during sustained high-rpm operation and wide-open throttle transitions. The larger orifice diameter compared to stock needle and seat assemblies reduces back-pressure in the fuel circuit, allowing the carburetor's metering block to maintain consistent float bowl level without hunting or surging. The adjustable design enables fine-tuning of seat height, giving tuners direct control over inlet needle engagement and fuel flow characteristics—critical when chasing optimal air-fuel ratios across varying load conditions and engine speeds.

This component is ideal for carburetor enthusiasts upgrading to larger fuel inlet needles or increasing boost pressure on forced-induction platforms where stock fuel delivery becomes the limiting factor. Installation requires basic carburetor knowledge and float bowl removal; the assembly seats directly into compatible Holley and Quick Fuel casting designs. Pair with matching hi-flow needles and quality fuel pump specification to fully leverage the increased orifice size and avoid fuel delivery issues. For racers and street tuners committed to carburetor optimization, the .120 Trick Hi-Flow Needle & Seat represents a foundational upgrade in fuel system flow architecture.