These traditional needle and seats from AED are designed for applications that are up to 650 hp on gas. These assemblies come complete with special reusable needle and seat gaskets.Features. Fuel Bowl Float Style - Center hung. Seat Size - 0.110 in.. Needle Material - Viton. Spring-Loaded - No. Adjustable - Yes. carburetor model - 4150 4500 4160 4165 4175