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Holley Needle & Seat 6-504

Part Number: HLY6-504
HOLLEY
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SKU:
HLY6-504
UPC:
90127075029
MPN:
6-504
Condition:
New
Availability:
Ships Same Business Day
Weight:
0.04 LBS
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$29.11
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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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Specs

MFG Part #:
6-504
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Fitment

Fitment for Holley Needle & Seat 6-504

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Big Power, Nice Sound!

Picked up a Pro Circuit pipe and silencer for my YZ125 it’s a game changer. The power feels way better and the sound is awesome.

Tyler D. - 06/12

Perfect Fit

First time ordering here and dang y’all knocked it outta the park! The wheels fit my Ranger UTV perfect, and I’ll definitely be back for more 5 stars all day!

Sarah L. - 08/24

Fast Shipping!!

Ordered on a Monday, and it was on my doorstep by Wednesday! Super impressed with how fast the shipping was.

Jason P. - 09/13

Helps keep cool, works great!

Bought the dual pass Allstar radiator for my build, and it’s been solid. Keeps the engine running cool even on the hottest days no complaints here!

Jake M. - 05/21

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