Billet Adjustable Vacuum Secondary
With more than 50 years experience in the high performance and racing fuel system industry. has announced their improved adjustable secondary housing for carburetors that employ a vacuum secondary system. There are a couple of drawbacks to factory-style vacuum-controlled secondaries: no adjustability and changing springs can lead to seal failures. Changing the secondary diaphragm can result in a torn or leaking seal. The Quick Set Adjustable Secondary Housing features a machined billet cover with an easy-access adjustment screw. This simple adjustment allows for a precise secondary opening for optimum secondary throttle response and performance on the track, trail or street. The adjustment needle changes not only the opening point (RPM) but also the rate (time to open) of the secondary. This is a great way to dial in optimum power at specific rpm ranges and is especially useful in racing situations where traction may be compromised and secondary timing is crucial. The Quick Set Adjustable Secondary Housing is also available with the original cover to comply with rules that require a stock appearance. Quick Fuel Technology, leaders in professional racing and custom street carburetors, kits and components for gas and alcohol applications can help make you a winner.