Removed from a running engine.
This alcohol carb begins as a WB3A but has the entire venturi area machined out and a CNC machined insert installed. The insert atomizes the alcohol with 10 equally placed outlets around the venturi. This carb allows for cleaner carburetion over a wider power band than the Big Bore Carb. This is a stock appearing carb and is not legal for stock class applications.
Per Buller site info.