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Details: Brian Tooley Racing BTR Dual Spring Kit .660" Steel Retainers This very popular Spring Kit is highly recommended when upgrading to a aftermarket Camshaft .660" Lift dual spring kit for LS engines using stock rocker arms. Included dual polished springs, matching Steel Retainers, locators for stock guides, locks and seals. Spring specs are 155 lbs @ 1.780", 380 lbs @ 1.180", 400 lbs @ 1.130, coil bind @ 1.070" This is a drop in spring kit for all 15 degree LS heads including LS1 LS2 LS3 LS4 LS6 L76 L92 L99 LQ4 LQ9 L33 LSA.
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