Straight Let Booster .136in (4pk)

The Advanced Engine Design Straight Leg Booster .136in (4-pack) is a precision carburetor venturi booster engineered to enhance fuel atomization and airflow optimization in Holley 4150 carburetors. These aluminum boosters feature a straight-leg design with a 0.136-inch orifice, delivering consistent jetting performance across a wide range of engine configurations. The 4-pack format ensures you have replacement or upgrade options for multi-carb setups or future tuning applications.

Each booster is machined from aluminum in a natural finish, prioritizing weight savings without sacrificing structural integrity. The .136-inch orifice size is a proven specification for mid-range naturally aspirated engines, balancing fuel delivery precision with air velocity. When installed correctly in the Holley 4150 venturi stack, these boosters improve fuel mixing and throttle response by increasing fuel droplet size distribution, which translates to more complete combustion and measurable improvements in idle quality and part-throttle drivability. The straight-leg configuration is compatible with standard Holley 4150 fuel inlet designs.

This product is essential for carb builders, engine builders, and street performance enthusiasts performing carburetor rebuilds, tuning refinements, or component replacement on legacy and modern classic vehicles. Whether you're addressing wear in existing boosters or experimenting with jetting changes during dyno tuning, having a complete set of four boosters on hand eliminates downtime and supports iterative testing. Advanced Engine Design's booster precision is recognized in the carburetor tuning community for consistent performance across multiple installations.