Edelbrock Throttle Linkage Carb Two Barrel Non Progressive 6X2 X1The Edelbrock part #1031 X1 Linkage Kit is designed to facilitate the synchronous operation of multiple two barrel carburetors. The #1031 kit is designed to support six two barrel carburetors installed on the Edelbrock X1 manifold for small block Chevy engines. It is a non progressive linkage, meaning that all six carburetors will open up at the same time and will maintain the same throttle angle relative to pedal position It is recommended that the