Holley
.150in Needle & Seat Assembly
SKU: H00E 6-521
Description
Part #: 6-521
With a .150" 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.
Features:
- Adjustable
- Titanium needle
- Compatable with racing fuels that contain benzine, acetone and alcohol
Inlet Needle Titanium Seat Size 0.150"
Fitment
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Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.
Available on iOS & Android
Specifications
| Brand | Holley |
| Part Number | H00E 6-521 |
| Weight | 0.04 lb |
Buy with Confidence
Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.
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