Drop Leg Booster - .160in Orifice (4)

The Advanced Engine Design Drop Leg Booster with 0.160-inch orifice is a precision carburetor venturi booster engineered to enhance fuel atomization and improve throttle response in classic Holley 4150-series four-barrel carburetors. This set of four aluminum boosters is designed for carb tuners and restoration enthusiasts building high-performance engines where precise fuel metering and consistent air-fuel mixture distribution directly impact power delivery across the RPM range.

The 0.160-inch orifice diameter is a critical specification that determines booster airflow capacity and fuel draw. This size strikes a balance between mid-range responsiveness and top-end power, making it suitable for street performance and moderate racing applications where reliability matters as much as horsepower gains. Advanced Engine Design manufactures these boosters in natural aluminum, which offers weight savings and resists corrosion when properly maintained. The drop-leg design positions the venturi tubes at the optimal angle relative to the main air passages, a detail that affects how consistently fuel enters the combustion chambers at part-throttle and wide-open-throttle conditions.

Holley 4150 carburetor owners upgrading fuel delivery systems will find this set essential when fine-tuning a rebuild. Whether you're restoring a classic muscle car, building a hot rod engine, or optimizing a vintage truck's performance, matching the correct booster orifice size to your engine displacement, intake manifold design, and intended power band ensures smooth idle quality, crisp throttle transitions, and improved driveability. Purchasing as a set of four ensures all boosters are matched and eliminates the performance inconsistency that can result from mixed components.