Brian Tooley Racing BTR Dual Spring Kit .660".SK001 Spring Kit is highly recommended when upgrading your camshaft..660" Lift dual spring kit for LS engines using stock rocker arms.Drop in spring kit for all 15 degree LS heads including LS1 LS2 LS3 LS4 LS6 L76 L92 L99 LQ4 LQ9 L33 LSA.Dual polished springs, matching retainers, locators for stock guides, locks and seals.Spring specs are as follows: 155 lbs @ 1.780" 380 lbs @ 1.180" 400 lbs @ 1.130" Coil bind @ 1.070"
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