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Holley

HOLLEY .150in Needle & Seat Assembly

MPN: 6-521 Catalog #: 001510091 Category: Carburetor Needle And Seats Check Vehicle Fitment

Product Details

Needle and Seat - Adjustable - 0.150 Orifice - Titanium - Holley Carburetors - Each

Inlet Needle Titanium; Seat Size 0.15 in.;

With a .150 inch seat, this needle and seat assembly is about as big as you can get. What's really trick, though, is that the needle is made of titanium. This needle design is very responsive to changes in flow rates and has excellent sealing capabilities.

Fitment: With a .150in. seat; this needle and seat assembly is about as big as you can get. What s really trick; though; is that the needle is made of titanium! This needle design is very responsive to changes in flow rates and has excellent sealing capabilities.

DETAILS:

Part Number 6-521 SPECS:

DETAILS:

  • Holley Performance Emission Code 5: This part is legal for sale or use on Emissions Controlled Vehicles; Uncontrolled (Non-Emissions Controlled) Vehicles; and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations
  • Carburetor Needle and Seat
  • Inlet Needle Titanium
  • Adjustable
  • Compatible With Racing Fuels
  • Titanium Needle
  • NEEDLE/SEAT;.150 TITANIUM
  • CrbNeedle/Seat

Part Number 6-521 SPECS:

  • WARNING CA Proposition 65 Message: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
  • WARNING CA Proposition 65: Yes

Vehicle Fitment

Universal or product-specific fitment. Please review the product details and contact us if you need help confirming fitment before ordering.

Product Specs

Brand
Holley
Part Number
6-521
Catalog Number
001510091
Product Line
Carburetor Needle and Seats
Category
Fuel Delivery
Type
Carburetor Needle And Seats
UPC / Barcode
090127465738
Length
5.00 in
Width
3.50 in
Height
1.20 in
Weight
0.03 lb
Freight / LTL
175.00
Ship Alone
No
Air Restricted
No
Hazmat
No
Chemical
No
Prop 65
B
Non-Returnable
No
Case Quantity
1
Kit
No

Shipping & Availability

Current status 11 Available - Ready to ship
Estimated timing Usually ships within 24hrs

This item is showing available inventory. Most in-stock performance parts ship quickly, but timing can vary by warehouse, vendor cut-off time, holidays, and carrier pickup.

Inventory shown: 11 available as of 6/3/2026.

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