These needle and seat assemblies will fit carburetors with center hung fuel bowls and can be used as replacements or performance upgrades. Kit includes needle and seat assembly, two gaskets and oneO-ring. For use with Holley 2300, 4150, 4160, 4165, 4175 and 4500 Series, Quick Fuel 4500, Professional Series and Q-Series, as well as various Demon carbs.
