'Seat' Dimensions:
Thread Diameter: 5/16"
Overall Length: .870" (not including needle)
Stock Replacement .119" diameter for Rochester 2G & 4G carburetors. Compatible with new alcohol enhanced fuels.
Note: 4G or 4 Jet carburetors use 2 needle and seat assemblies per carburetor, and may be different sizes in the primary and secondary sides.