Holley Carb Secondaries Problem

[wr3stler17]

What's up everyone I have a 351w with a holley 600 cfm 4 barrel with vacuum secondaries and the secondaries are opening too early. Is getting a spring kit the only way to adjust when they open? Any answer would be appreciated.
Thanks

 

[rbohm]

yes the only way to tune the opening rate and timing is by changing the secondary spring. holley has such a kit available with a variety of springs in various colors, along with which color springs are doing what. you need a stiffer spring.