Custom tailor accelerator pump timing to your specific engine needs. Includes 8 cams for modular four barrels and two barrels with 2 screws.

Calibrate the accelerator pump discharge volume to your particular application by changing the pump nozzle. Use of the hollow screw allows increased fuel flow ensuring the nozzle is the controlling factor in fuel delivery. Choose either the tube type or s

Complete assortment of 7 different diaphragm springs for vacuum secondary carburetors. The stiffness of the spring determines when the secondaries open.

Calibrate the accelerator pump discharge volume to your particular application by changing the pump nozzle. Use of the hollow screw allows increased fuel flow ensuring the nozzle is the controlling factor in fuel delivery. Choose either the tube type or s

Anti-pullover nozzles are used to combat a condition that is sometimes called "pump pull-over". As a stream of air rushes past the discharge nozzle it has a tendency to pull fuel from the nozzle, especially on smaller cubic inch engines. Sold per pair.

Pair of 30cc accelerator pump diaphragms

Accelerator pump check valve for use with Street Demon® carburetors

Inlet needle and seat assembly for Street Demon® carburetors

Fast idle solenoid for Street Demon carburetors

Holley's BILLET LS Throttle Bodies are the MOST FEATURE LOADED available. Holley went back to the drawing board and built the ultimate air valve for your LS engine! The 112-589 throttle body features a 90 millimeter bore and a low RPM drive friendly...

Holley's new 1000 CFM Throttle Body shares the same air entry area design that powers every NASCAR Sprint Cup Series™ car! The throttle body features integrated throttle position, idle air control and intake air temperature sensors, Ford and GM...

Holley's new 1000 CFM Throttle Body shares the same air entry area design that powers every NASCAR Sprint Cup Series™ car! The throttle body features integrated throttle position, idle air control and intake air temperature sensors, Ford and GM...