The JET Holley Stage 4 HP Series Carburetor is a universal carburetor. The Holley Carburetor is available with trimmed throttle shafts and blueprinted metering rods. This exceptional carburetor provides best airflow. The JET Holley Carburetor is able to balance the main well volumes and improve the emulsion system. The Holley Carburetor features idle circuit calibration. This high quality carburetor is provided with better fuel curve and atomization. But, please, keep in mind that the installed product cannot be returned.