AED covers the complete spectrum of Needle and Seats for gasoline and alcohol carburetors. First AED has the traditional . 110" Viton hi-flow units designed for up to 650 HP on gas. For power levels over 650 HP with single carburetors or with marginal fuel systems we recommend AED's special . 125" viton tipped assemblies which flow approximately 25% more fuel than the . 110's and will accept up to 7-8 pounds of fuel pressure. For alcohol applications the AED . 150" stainless steel needle and seats are the ultimate in fuel capacity and seating ability where optimum fuel flow is required. These special hi-flow needle and seats will not accept the standard 7-8 psi at idle like conventional needle and seats. Reduced fuel pressure at idle is required to properly seat at idle. All assemblies come complete with AED's special reusable needle and seat gaskets.Pit Stop USA offers AED .110" Viton Needle & Seat Assembly - Set of 2 5110 at low everyday prices. Be sure to check out all of our products from AED - Advanced Engine Design including AED Needle and Seat.