A range of aluminium carburetor inlet adapters to suit U.S. 4 barrel carbs.
Thread A: The thread of the carb inlet.
Thread B: The AN (JIC) thread to which the fuel feed hose connects.
Style A: Short Male/Male Adapter.
Style B: 2" Long Extended Male Male Adapter.
Style C: 3" Long Extended Male Male Adapter.
Style D: Extended Male to Female Adapter.
Carb Inlet Thread Guide
Holley Carburetors: 7/8"-20 threads
Holley Ultra HP: 3/4"-16 ORB threads
BG/Demon style Carburetors: 9/16"-24
Carter & Edelbrock Carburetors: 5/8"-20