Dial-in your fuel curve for optimum performance.
These Edelbrock carburetor step-up spring assortments are just what you need to fine-tune your Edelbrock Performer series and Thunder series AVS carburetors.

Kit contains:
* One 3 in. Hg blue spring
* One 4 in. Hg yellow spring
* One 5 in. Hg orange spring
* One 6 in. Hg pink spring
* One 7 in. Hg plain spring