Spring Set, Vacuum Secondary, Holley, Carburetor

Carburetor Vacuum Secondary Spring Set, 7-Piece by Holley®

Seven spring choices allow secondary opening behavior to be matched to the engine combination.

This Holley® set supplies seven steel springs for calibrating a compatible vacuum-secondary carburetor. Different spring forces change how readily the secondaries open in response to engine demand, allowing adjustment for the engine and vehicle combination. The assortment supports controlled tuning changes without substituting a fixed mechanical-secondary linkage. Check the secondary response after each change rather than assuming one spring is correct for every engine.

• Seven vacuum-secondary calibration springs • Steel springs with assorted forces • Adjusts secondary opening behavior • Compatible vacuum-secondary carburetor tuning