This 10-pack of Holley needle and seat assemblies (P/N 6-504) features an adjustable 0.110" seat size for fine-tuning carburetor fuel level, with a Viton tip for consistent sealing.
Specifications:
- Contents: 10-pack of P/N 6-504 assemblies
- Seat Size: Adjustable, 0.110"
- Needle Length: 0.65"
- Material: Brass
- Tip: Viton
- Warranty: Manufacturer's Limited 90 Day Warranty
- Part Number: 1018-135
FAQ
How many needle and seat assemblies are in the 1018-135 kit?
It's a 10-pack of part number 6-504 assemblies.
What seat size does this assembly use?
An adjustable 0.110" seat size.
What material is the tip made of?
Viton, for consistent sealing against fuel.

