New vacuum secondary quick change housing and spring kit for Holley 4150 & 4160 type carbs. Quick Fuel Technology part #38-1000.

 Kit includes: New upper housing & top, secondary diaphragm, O ring, choke hardware, and secondary tip in spring assortment.

Control secondary tip in rate and improve torque & horsepower by being able to change secondary springs in about 1 minute. Does not disturb secondary diaphragm when changing springs.

Will fit Holley 4150, 4160, some 4165, Avenger, & Street Avenger. Also fits similar Barry Grant, Demon, QFT, Proform, AED, & many others.

Manufactured from the highest quality materials.

Combine with other items & save on shipping.

Custom rebuild kits also available. The finest parts money can buy. Contact me for a quote.

25+ yrs. rebuilding & modifying Holley carbs. Hundreds of parts in stock. Anything you need, feel free to get in touch.

Thanx for looking ! ! !