Description
A worn or improperly seated needle and seat assembly directly impacts fuel delivery precision and carburetor response—critical factors for consistent performance across wide throttle ranges. The Holley 6-504 restores tight metering control, eliminating lean surges and fuel starvation that compromise acceleration and reliability. Whether you’re rebuilding a street carb or fine-tuning a race engine, this adjustable assembly gives you the exact fuel regulation your application demands.
- Needle and seat assembly
- Adjustable design
- 0.110″ orifice
- Viton seals included
- Holley carburetor compatible
- Sold individually
- Bolt-on installation
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