Jun 20, 2022 ยท Holley Needle and Seat Assemblies 56 Customer Reviews Holley needle and seat assemblies can be used as replacements or performance upgrades. Available in different sizes, they're also available in different materials to suit a wide range of applications.. From looking at holley's instructions on the non adjustable setting the float should be level with the fuel bowl turned upside down the needle should be fully seated. Is my adjustment correct in this picture or is it a little too high and will make my fuel level to high?. This item: Holley 6-511 Viton Inlet Needle. $15.84. Only 5 left in stock - order soon. Ships from and sold by Allstate Carburetor. FREE Shipping. Holley 216-43 Non-Adjustable Side Hung Float. $12.27. In Stock. Ships from and sold by Allstate Carburetor.. "/>Holley non adjustable needle and seat