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Performance LS1 ovate beehive valve spring for applications up to 0.625 lift. This is a drop-in spring that fits stock seats and retainers This spring has higher loading for more demanding applications.

The PAC single valve springs will use your factory seats, seals, retainers, and locks! We recommend stepping up to a dual valve spring kit if you plan to run more than .625" lift and/or a valve larger than 2.08" diameter.