Edelbrock Vacuum Secondary Spring Kit Includes 7 Springs Fits Holley 4150 4150Hp 4160 Series

This is the Edelbrock Vacuum Secondary Spring Kit, part number 12412. It includes seven different springs designed to help you tune the vacuum secondary operation on Holley 4150, 4150HP, and 4160 series carburetors, as well as some Demon and Quick Fuel models. Getting the secondary throttle plates to open at the right time and rate is key to good performance, especially when you're looking for improved throttle response and power delivery.

With this kit, you get a range of spring tensions. This allows you to experiment and find the perfect setting for your specific engine and driving needs. A lighter spring will make the secondaries open sooner and more easily, while a stiffer spring will delay their opening, which can be beneficial in certain applications to prevent bogging or improve traction. This is a well-built replacement for worn-out springs or for anyone wanting to fine-tune their carburetor's performance.

This kit fits a wide variety of vehicles, including many Chevrolet C/K series trucks, Camaro, Caprice, and Impala models from the 1980s, as well as some Chrysler and Buick applications. It's a straightforward way to make a notable change in how your carburetor performs.