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.660" Lift Dual Spring Kit for LS engines using stock rocker arms. Includes dual polished springs, matching tool steel retainers, locators of your choice for stock or bronze guides, locks and seals. Spring specs are 155 lbs @ 1.780", 380 lbs @ 1.180", 400 lbs @ 1.130, coild bind @ 1.070" This is a drop in spring kit for the following engines: LS1 LS2 LS3 LS4 LS6 L76 L92 L99 LQ4 LQ9 L33 LSA. This kit will not fit LS9 engines.